forked from KolibriOS/kolibrios
793 lines
25 KiB
C
793 lines
25 KiB
C
/*
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* MMAL Video Decoder
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* Copyright (c) 2015 Rodger Combs
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* MMAL Video Decoder
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*/
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#include <bcm_host.h>
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#include <interface/mmal/mmal.h>
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#include <interface/mmal/util/mmal_util.h>
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#include <interface/mmal/util/mmal_util_params.h>
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#include <interface/mmal/util/mmal_default_components.h>
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#include <interface/mmal/vc/mmal_vc_api.h>
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#include "avcodec.h"
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#include "internal.h"
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#include "libavutil/atomic.h"
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#include "libavutil/avassert.h"
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#include "libavutil/buffer.h"
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "libavutil/log.h"
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typedef struct FFBufferEntry {
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AVBufferRef *ref;
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void *data;
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size_t length;
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int64_t pts, dts;
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int flags;
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struct FFBufferEntry *next;
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} FFBufferEntry;
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// MMAL_POOL_T destroys all of its MMAL_BUFFER_HEADER_Ts. If we want correct
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// refcounting for AVFrames, we can free the MMAL_POOL_T only after all AVFrames
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// have been unreferenced.
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typedef struct FFPoolRef {
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volatile int refcount;
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MMAL_POOL_T *pool;
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} FFPoolRef;
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typedef struct FFBufferRef {
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MMAL_BUFFER_HEADER_T *buffer;
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FFPoolRef *pool;
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} FFBufferRef;
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typedef struct MMALDecodeContext {
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AVClass *av_class;
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int extra_buffers;
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AVBitStreamFilterContext *bsfc;
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MMAL_COMPONENT_T *decoder;
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MMAL_QUEUE_T *queue_decoded_frames;
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MMAL_POOL_T *pool_in;
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FFPoolRef *pool_out;
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// Waiting input packets. Because the libavcodec API requires decoding and
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// returning packets in lockstep, it can happen that queue_decoded_frames
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// contains almost all surfaces - then the decoder input queue can quickly
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// fill up and won't accept new input either. Without consuming input, the
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// libavcodec API can't return new frames, and we have a logical deadlock.
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// This is avoided by queuing such buffers here.
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FFBufferEntry *waiting_buffers, *waiting_buffers_tail;
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int64_t packets_sent;
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int64_t frames_output;
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int eos_received;
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int eos_sent;
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} MMALDecodeContext;
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// Assume decoder is guaranteed to produce output after at least this many
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// packets (where each packet contains 1 frame).
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#define MAX_DELAYED_FRAMES 16
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static void ffmmal_poolref_unref(FFPoolRef *ref)
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{
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if (ref && avpriv_atomic_int_add_and_fetch(&ref->refcount, -1) == 0) {
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mmal_pool_destroy(ref->pool);
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av_free(ref);
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}
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}
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static void ffmmal_release_frame(void *opaque, uint8_t *data)
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{
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FFBufferRef *ref = (void *)data;
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mmal_buffer_header_release(ref->buffer);
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ffmmal_poolref_unref(ref->pool);
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av_free(ref);
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}
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// Setup frame with a new reference to buffer. The buffer must have been
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// allocated from the given pool.
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static int ffmmal_set_ref(AVFrame *frame, FFPoolRef *pool,
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MMAL_BUFFER_HEADER_T *buffer)
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{
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FFBufferRef *ref = av_mallocz(sizeof(*ref));
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if (!ref)
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return AVERROR(ENOMEM);
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ref->pool = pool;
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ref->buffer = buffer;
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frame->buf[0] = av_buffer_create((void *)ref, sizeof(*ref),
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ffmmal_release_frame, NULL,
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AV_BUFFER_FLAG_READONLY);
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if (!frame->buf[0]) {
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av_free(ref);
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return AVERROR(ENOMEM);
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}
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avpriv_atomic_int_add_and_fetch(&ref->pool->refcount, 1);
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mmal_buffer_header_acquire(buffer);
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frame->format = AV_PIX_FMT_MMAL;
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frame->data[3] = (uint8_t *)ref->buffer;
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return 0;
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}
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static void ffmmal_stop_decoder(AVCodecContext *avctx)
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{
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MMALDecodeContext *ctx = avctx->priv_data;
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MMAL_COMPONENT_T *decoder = ctx->decoder;
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MMAL_BUFFER_HEADER_T *buffer;
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mmal_port_disable(decoder->input[0]);
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mmal_port_disable(decoder->output[0]);
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mmal_port_disable(decoder->control);
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mmal_port_flush(decoder->input[0]);
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mmal_port_flush(decoder->output[0]);
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mmal_port_flush(decoder->control);
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while ((buffer = mmal_queue_get(ctx->queue_decoded_frames)))
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mmal_buffer_header_release(buffer);
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while (ctx->waiting_buffers) {
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FFBufferEntry *buffer = ctx->waiting_buffers;
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ctx->waiting_buffers = buffer->next;
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av_buffer_unref(&buffer->ref);
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av_free(buffer);
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}
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ctx->waiting_buffers_tail = NULL;
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ctx->frames_output = ctx->eos_received = ctx->eos_sent = ctx->packets_sent = 0;
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}
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static av_cold int ffmmal_close_decoder(AVCodecContext *avctx)
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{
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MMALDecodeContext *ctx = avctx->priv_data;
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if (ctx->decoder)
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ffmmal_stop_decoder(avctx);
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mmal_component_destroy(ctx->decoder);
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ctx->decoder = NULL;
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mmal_queue_destroy(ctx->queue_decoded_frames);
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mmal_pool_destroy(ctx->pool_in);
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ffmmal_poolref_unref(ctx->pool_out);
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if (ctx->bsfc)
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av_bitstream_filter_close(ctx->bsfc);
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mmal_vc_deinit();
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return 0;
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}
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static void input_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
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{
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if (!buffer->cmd) {
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AVBufferRef *buf = buffer->user_data;
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av_buffer_unref(&buf);
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}
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mmal_buffer_header_release(buffer);
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}
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static void output_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
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{
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AVCodecContext *avctx = (AVCodecContext*)port->userdata;
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MMALDecodeContext *ctx = avctx->priv_data;
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mmal_queue_put(ctx->queue_decoded_frames, buffer);
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}
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static void control_port_cb(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
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{
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AVCodecContext *avctx = (AVCodecContext*)port->userdata;
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MMAL_STATUS_T status;
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if (buffer->cmd == MMAL_EVENT_ERROR) {
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status = *(uint32_t *)buffer->data;
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av_log(avctx, AV_LOG_ERROR, "MMAL error %d on control port\n", (int)status);
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} else {
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char s[20];
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av_get_codec_tag_string(s, sizeof(s), buffer->cmd);
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av_log(avctx, AV_LOG_WARNING, "Unknown MMAL event %s on control port\n", s);
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}
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mmal_buffer_header_release(buffer);
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}
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// Feed free output buffers to the decoder.
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static int ffmmal_fill_output_port(AVCodecContext *avctx)
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{
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MMALDecodeContext *ctx = avctx->priv_data;
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MMAL_BUFFER_HEADER_T *buffer;
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MMAL_STATUS_T status;
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if (!ctx->pool_out)
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return AVERROR_UNKNOWN; // format change code failed with OOM previously
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while ((buffer = mmal_queue_get(ctx->pool_out->pool->queue))) {
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if ((status = mmal_port_send_buffer(ctx->decoder->output[0], buffer))) {
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mmal_buffer_header_release(buffer);
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av_log(avctx, AV_LOG_ERROR, "MMAL error %d when sending output buffer.\n", (int)status);
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return AVERROR_UNKNOWN;
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}
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}
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return 0;
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}
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static enum AVColorSpace ffmmal_csp_to_av_csp(MMAL_FOURCC_T fourcc)
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{
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switch (fourcc) {
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case MMAL_COLOR_SPACE_BT470_2_BG:
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case MMAL_COLOR_SPACE_BT470_2_M:
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case MMAL_COLOR_SPACE_ITUR_BT601: return AVCOL_SPC_BT470BG;
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case MMAL_COLOR_SPACE_ITUR_BT709: return AVCOL_SPC_BT709;
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case MMAL_COLOR_SPACE_FCC: return AVCOL_SPC_FCC;
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case MMAL_COLOR_SPACE_SMPTE240M: return AVCOL_SPC_SMPTE240M;
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default: return AVCOL_SPC_UNSPECIFIED;
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}
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}
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static int ffmal_update_format(AVCodecContext *avctx)
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{
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MMALDecodeContext *ctx = avctx->priv_data;
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MMAL_STATUS_T status;
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int ret = 0;
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MMAL_COMPONENT_T *decoder = ctx->decoder;
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MMAL_ES_FORMAT_T *format_out = decoder->output[0]->format;
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ffmmal_poolref_unref(ctx->pool_out);
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if (!(ctx->pool_out = av_mallocz(sizeof(*ctx->pool_out)))) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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ctx->pool_out->refcount = 1;
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if (!format_out)
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goto fail;
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if ((status = mmal_port_parameter_set_uint32(decoder->output[0], MMAL_PARAMETER_EXTRA_BUFFERS, ctx->extra_buffers)))
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goto fail;
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if (avctx->pix_fmt == AV_PIX_FMT_MMAL) {
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format_out->encoding = MMAL_ENCODING_OPAQUE;
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} else {
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format_out->encoding_variant = format_out->encoding = MMAL_ENCODING_I420;
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}
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if ((status = mmal_port_format_commit(decoder->output[0])))
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goto fail;
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if ((ret = ff_set_dimensions(avctx, format_out->es->video.crop.x + format_out->es->video.crop.width,
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format_out->es->video.crop.y + format_out->es->video.crop.height)) < 0)
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goto fail;
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if (format_out->es->video.par.num && format_out->es->video.par.den) {
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avctx->sample_aspect_ratio.num = format_out->es->video.par.num;
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avctx->sample_aspect_ratio.den = format_out->es->video.par.den;
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}
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avctx->colorspace = ffmmal_csp_to_av_csp(format_out->es->video.color_space);
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decoder->output[0]->buffer_size =
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FFMAX(decoder->output[0]->buffer_size_min, decoder->output[0]->buffer_size_recommended);
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decoder->output[0]->buffer_num =
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FFMAX(decoder->output[0]->buffer_num_min, decoder->output[0]->buffer_num_recommended) + ctx->extra_buffers;
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ctx->pool_out->pool = mmal_pool_create(decoder->output[0]->buffer_num,
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decoder->output[0]->buffer_size);
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if (!ctx->pool_out->pool) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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return 0;
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fail:
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return ret < 0 ? ret : AVERROR_UNKNOWN;
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}
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static av_cold int ffmmal_init_decoder(AVCodecContext *avctx)
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{
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MMALDecodeContext *ctx = avctx->priv_data;
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MMAL_STATUS_T status;
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MMAL_ES_FORMAT_T *format_in;
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MMAL_COMPONENT_T *decoder;
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int ret = 0;
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bcm_host_init();
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if (mmal_vc_init()) {
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av_log(avctx, AV_LOG_ERROR, "Cannot initialize MMAL VC driver!\n");
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return AVERROR(ENOSYS);
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}
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if ((ret = ff_get_format(avctx, avctx->codec->pix_fmts)) < 0)
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return ret;
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avctx->pix_fmt = ret;
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if ((status = mmal_component_create(MMAL_COMPONENT_DEFAULT_VIDEO_DECODER, &ctx->decoder)))
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goto fail;
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decoder = ctx->decoder;
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format_in = decoder->input[0]->format;
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format_in->type = MMAL_ES_TYPE_VIDEO;
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format_in->encoding = MMAL_ENCODING_H264;
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format_in->es->video.width = FFALIGN(avctx->width, 32);
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format_in->es->video.height = FFALIGN(avctx->height, 16);
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format_in->es->video.crop.width = avctx->width;
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format_in->es->video.crop.height = avctx->height;
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format_in->es->video.frame_rate.num = 24000;
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format_in->es->video.frame_rate.den = 1001;
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format_in->es->video.par.num = avctx->sample_aspect_ratio.num;
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format_in->es->video.par.den = avctx->sample_aspect_ratio.den;
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format_in->flags = MMAL_ES_FORMAT_FLAG_FRAMED;
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if (avctx->codec->id == AV_CODEC_ID_H264 && avctx->extradata && avctx->extradata[0] == 1) {
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uint8_t *dummy_p;
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int dummy_int;
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ctx->bsfc = av_bitstream_filter_init("h264_mp4toannexb");
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if (!ctx->bsfc) {
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av_log(avctx, AV_LOG_ERROR, "Cannot open the h264_mp4toannexb BSF!\n");
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ret = AVERROR(ENOSYS);
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goto fail;
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}
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av_bitstream_filter_filter(ctx->bsfc, avctx, "private_spspps_buf", &dummy_p, &dummy_int, NULL, 0, 0);
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} else if (avctx->extradata_size) {
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if ((status = mmal_format_extradata_alloc(format_in, avctx->extradata_size)))
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goto fail;
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format_in->extradata_size = avctx->extradata_size;
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memcpy(format_in->extradata, avctx->extradata, format_in->extradata_size);
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}
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if ((status = mmal_port_format_commit(decoder->input[0])))
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goto fail;
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decoder->input[0]->buffer_num =
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FFMAX(decoder->input[0]->buffer_num_min, 20);
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decoder->input[0]->buffer_size =
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FFMAX(decoder->input[0]->buffer_size_min, 512 * 1024);
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ctx->pool_in = mmal_pool_create(decoder->input[0]->buffer_num, 0);
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if (!ctx->pool_in) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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if ((ret = ffmal_update_format(avctx)) < 0)
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goto fail;
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ctx->queue_decoded_frames = mmal_queue_create();
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if (!ctx->queue_decoded_frames)
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goto fail;
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decoder->input[0]->userdata = (void*)avctx;
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decoder->output[0]->userdata = (void*)avctx;
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decoder->control->userdata = (void*)avctx;
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if ((status = mmal_port_enable(decoder->control, control_port_cb)))
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goto fail;
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if ((status = mmal_port_enable(decoder->input[0], input_callback)))
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goto fail;
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if ((status = mmal_port_enable(decoder->output[0], output_callback)))
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goto fail;
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if ((status = mmal_component_enable(decoder)))
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goto fail;
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return 0;
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fail:
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ffmmal_close_decoder(avctx);
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return ret < 0 ? ret : AVERROR_UNKNOWN;
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}
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static void ffmmal_flush(AVCodecContext *avctx)
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{
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MMALDecodeContext *ctx = avctx->priv_data;
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MMAL_COMPONENT_T *decoder = ctx->decoder;
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MMAL_STATUS_T status;
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ffmmal_stop_decoder(avctx);
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if ((status = mmal_port_enable(decoder->control, control_port_cb)))
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goto fail;
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if ((status = mmal_port_enable(decoder->input[0], input_callback)))
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goto fail;
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if ((status = mmal_port_enable(decoder->output[0], output_callback)))
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goto fail;
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return;
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fail:
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av_log(avctx, AV_LOG_ERROR, "MMAL flush error: %i\n", (int)status);
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}
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// Split packets and add them to the waiting_buffers list. We don't queue them
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// immediately, because it can happen that the decoder is temporarily blocked
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// (due to us not reading/returning enough output buffers) and won't accept
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// new input. (This wouldn't be an issue if MMAL input buffers always were
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// complete frames - then the input buffer just would have to be big enough.)
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static int ffmmal_add_packet(AVCodecContext *avctx, AVPacket *avpkt)
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{
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MMALDecodeContext *ctx = avctx->priv_data;
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AVBufferRef *buf = NULL;
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int size = 0;
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uint8_t *data = (uint8_t *)"";
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uint8_t *start;
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int ret = 0;
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if (avpkt->size) {
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if (ctx->bsfc) {
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uint8_t *tmp_data;
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int tmp_size;
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if ((ret = av_bitstream_filter_filter(ctx->bsfc, avctx, "private_spspps_buf",
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&tmp_data, &tmp_size,
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avpkt->data, avpkt->size,
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avpkt->flags & AV_PKT_FLAG_KEY)) < 0)
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goto done;
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buf = av_buffer_create(tmp_data, tmp_size, NULL, NULL, 0);
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} else {
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if (avpkt->buf) {
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buf = av_buffer_ref(avpkt->buf);
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} else {
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buf = av_buffer_alloc(avpkt->size);
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if (buf)
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memcpy(buf->data, avpkt->data, avpkt->size);
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}
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}
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if (!buf) {
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ret = AVERROR(ENOMEM);
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goto done;
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}
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size = buf->size;
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data = buf->data;
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ctx->packets_sent++;
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} else {
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if (!ctx->packets_sent) {
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// Short-cut the flush logic to avoid upsetting MMAL.
|
|
ctx->eos_sent = 1;
|
|
ctx->eos_received = 1;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
start = data;
|
|
|
|
do {
|
|
FFBufferEntry *buffer = av_mallocz(sizeof(*buffer));
|
|
if (!buffer) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto done;
|
|
}
|
|
|
|
buffer->data = data;
|
|
buffer->length = FFMIN(size, ctx->decoder->input[0]->buffer_size);
|
|
|
|
if (data == start)
|
|
buffer->flags |= MMAL_BUFFER_HEADER_FLAG_FRAME_START;
|
|
|
|
data += buffer->length;
|
|
size -= buffer->length;
|
|
|
|
buffer->pts = avpkt->pts == AV_NOPTS_VALUE ? MMAL_TIME_UNKNOWN : avpkt->pts;
|
|
buffer->dts = avpkt->dts == AV_NOPTS_VALUE ? MMAL_TIME_UNKNOWN : avpkt->dts;
|
|
|
|
if (!size)
|
|
buffer->flags |= MMAL_BUFFER_HEADER_FLAG_FRAME_END;
|
|
|
|
if (!buffer->length) {
|
|
buffer->flags |= MMAL_BUFFER_HEADER_FLAG_EOS;
|
|
ctx->eos_sent = 1;
|
|
}
|
|
|
|
if (buf) {
|
|
buffer->ref = av_buffer_ref(buf);
|
|
if (!buffer->ref) {
|
|
av_free(buffer);
|
|
ret = AVERROR(ENOMEM);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
// Insert at end of the list
|
|
if (!ctx->waiting_buffers)
|
|
ctx->waiting_buffers = buffer;
|
|
if (ctx->waiting_buffers_tail)
|
|
ctx->waiting_buffers_tail->next = buffer;
|
|
ctx->waiting_buffers_tail = buffer;
|
|
} while (size);
|
|
|
|
done:
|
|
av_buffer_unref(&buf);
|
|
return ret;
|
|
}
|
|
|
|
// Move prepared/split packets from waiting_buffers to the MMAL decoder.
|
|
static int ffmmal_fill_input_port(AVCodecContext *avctx)
|
|
{
|
|
MMALDecodeContext *ctx = avctx->priv_data;
|
|
|
|
while (ctx->waiting_buffers) {
|
|
MMAL_BUFFER_HEADER_T *mbuffer;
|
|
FFBufferEntry *buffer;
|
|
MMAL_STATUS_T status;
|
|
|
|
mbuffer = mmal_queue_get(ctx->pool_in->queue);
|
|
if (!mbuffer)
|
|
return 0;
|
|
|
|
buffer = ctx->waiting_buffers;
|
|
|
|
mmal_buffer_header_reset(mbuffer);
|
|
mbuffer->cmd = 0;
|
|
mbuffer->pts = buffer->pts;
|
|
mbuffer->dts = buffer->dts;
|
|
mbuffer->flags = buffer->flags;
|
|
mbuffer->data = buffer->data;
|
|
mbuffer->length = buffer->length;
|
|
mbuffer->user_data = buffer->ref;
|
|
mbuffer->alloc_size = ctx->decoder->input[0]->buffer_size;
|
|
|
|
if ((status = mmal_port_send_buffer(ctx->decoder->input[0], mbuffer))) {
|
|
mmal_buffer_header_release(mbuffer);
|
|
av_buffer_unref(&buffer->ref);
|
|
}
|
|
|
|
// Remove from start of the list
|
|
ctx->waiting_buffers = buffer->next;
|
|
if (ctx->waiting_buffers_tail == buffer)
|
|
ctx->waiting_buffers_tail = NULL;
|
|
av_free(buffer);
|
|
|
|
if (status) {
|
|
av_log(avctx, AV_LOG_ERROR, "MMAL error %d when sending input\n", (int)status);
|
|
return AVERROR_UNKNOWN;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ffmal_copy_frame(AVCodecContext *avctx, AVFrame *frame,
|
|
MMAL_BUFFER_HEADER_T *buffer)
|
|
{
|
|
MMALDecodeContext *ctx = avctx->priv_data;
|
|
int ret = 0;
|
|
|
|
if (avctx->pix_fmt == AV_PIX_FMT_MMAL) {
|
|
if (!ctx->pool_out)
|
|
return AVERROR_UNKNOWN; // format change code failed with OOM previously
|
|
|
|
if ((ret = ff_decode_frame_props(avctx, frame)) < 0)
|
|
goto done;
|
|
|
|
if ((ret = ffmmal_set_ref(frame, ctx->pool_out, buffer)) < 0)
|
|
goto done;
|
|
} else {
|
|
int w = FFALIGN(avctx->width, 32);
|
|
int h = FFALIGN(avctx->height, 16);
|
|
char *ptr;
|
|
int plane;
|
|
int i;
|
|
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
goto done;
|
|
|
|
ptr = buffer->data + buffer->type->video.offset[0];
|
|
for (i = 0; i < avctx->height; i++)
|
|
memcpy(frame->data[0] + frame->linesize[0] * i, ptr + w * i, avctx->width);
|
|
|
|
ptr += w * h;
|
|
|
|
for (plane = 1; plane < 3; plane++) {
|
|
for (i = 0; i < avctx->height / 2; i++)
|
|
memcpy(frame->data[plane] + frame->linesize[plane] * i, ptr + w / 2 * i, (avctx->width + 1) / 2);
|
|
ptr += w / 2 * h / 2;
|
|
}
|
|
}
|
|
|
|
if (buffer->pts != MMAL_TIME_UNKNOWN) {
|
|
frame->pkt_pts = buffer->pts;
|
|
frame->pts = buffer->pts;
|
|
}
|
|
|
|
done:
|
|
return ret;
|
|
}
|
|
|
|
// Fetch a decoded buffer and place it into the frame parameter.
|
|
static int ffmmal_read_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame)
|
|
{
|
|
MMALDecodeContext *ctx = avctx->priv_data;
|
|
MMAL_BUFFER_HEADER_T *buffer = NULL;
|
|
MMAL_STATUS_T status = 0;
|
|
int ret = 0;
|
|
|
|
if (ctx->eos_received)
|
|
goto done;
|
|
|
|
while (1) {
|
|
// To ensure decoding in lockstep with a constant delay between fed packets
|
|
// and output frames, we always wait until an output buffer is available.
|
|
// Except during start we don't know after how many input packets the decoder
|
|
// is going to return the first buffer, and we can't distinguish decoder
|
|
// being busy from decoder waiting for input. So just poll at the start and
|
|
// keep feeding new data to the buffer.
|
|
// We are pretty sure the decoder will produce output if we sent more input
|
|
// frames than what a h264 decoder could logically delay. This avoids too
|
|
// excessive buffering.
|
|
// We also wait if we sent eos, but didn't receive it yet (think of decoding
|
|
// stream with a very low number of frames).
|
|
if (ctx->frames_output || ctx->packets_sent > MAX_DELAYED_FRAMES ||
|
|
(ctx->packets_sent && ctx->eos_sent)) {
|
|
// MMAL will ignore broken input packets, which means the frame we
|
|
// expect here may never arrive. Dealing with this correctly is
|
|
// complicated, so here's a hack to avoid that it freezes forever
|
|
// in this unlikely situation.
|
|
buffer = mmal_queue_timedwait(ctx->queue_decoded_frames, 100);
|
|
if (!buffer) {
|
|
av_log(avctx, AV_LOG_ERROR, "Did not get output frame from MMAL.\n");
|
|
ret = AVERROR_UNKNOWN;
|
|
goto done;
|
|
}
|
|
} else {
|
|
buffer = mmal_queue_get(ctx->queue_decoded_frames);
|
|
if (!buffer)
|
|
goto done;
|
|
}
|
|
|
|
ctx->eos_received |= !!(buffer->flags & MMAL_BUFFER_HEADER_FLAG_EOS);
|
|
if (ctx->eos_received)
|
|
goto done;
|
|
|
|
if (buffer->cmd == MMAL_EVENT_FORMAT_CHANGED) {
|
|
MMAL_COMPONENT_T *decoder = ctx->decoder;
|
|
MMAL_EVENT_FORMAT_CHANGED_T *ev = mmal_event_format_changed_get(buffer);
|
|
MMAL_BUFFER_HEADER_T *stale_buffer;
|
|
|
|
av_log(avctx, AV_LOG_INFO, "Changing output format.\n");
|
|
|
|
if ((status = mmal_port_disable(decoder->output[0])))
|
|
goto done;
|
|
|
|
while ((stale_buffer = mmal_queue_get(ctx->queue_decoded_frames)))
|
|
mmal_buffer_header_release(stale_buffer);
|
|
|
|
mmal_format_copy(decoder->output[0]->format, ev->format);
|
|
|
|
if ((ret = ffmal_update_format(avctx)) < 0)
|
|
goto done;
|
|
|
|
if ((status = mmal_port_enable(decoder->output[0], output_callback)))
|
|
goto done;
|
|
|
|
if ((ret = ffmmal_fill_output_port(avctx)) < 0)
|
|
goto done;
|
|
|
|
if ((ret = ffmmal_fill_input_port(avctx)) < 0)
|
|
goto done;
|
|
|
|
mmal_buffer_header_release(buffer);
|
|
continue;
|
|
} else if (buffer->cmd) {
|
|
char s[20];
|
|
av_get_codec_tag_string(s, sizeof(s), buffer->cmd);
|
|
av_log(avctx, AV_LOG_WARNING, "Unknown MMAL event %s on output port\n", s);
|
|
goto done;
|
|
} else if (buffer->length == 0) {
|
|
// Unused output buffer that got drained after format change.
|
|
mmal_buffer_header_release(buffer);
|
|
continue;
|
|
}
|
|
|
|
ctx->frames_output++;
|
|
|
|
if ((ret = ffmal_copy_frame(avctx, frame, buffer)) < 0)
|
|
goto done;
|
|
|
|
*got_frame = 1;
|
|
break;
|
|
}
|
|
|
|
done:
|
|
if (buffer)
|
|
mmal_buffer_header_release(buffer);
|
|
if (status && ret >= 0)
|
|
ret = AVERROR_UNKNOWN;
|
|
return ret;
|
|
}
|
|
|
|
static int ffmmal_decode(AVCodecContext *avctx, void *data, int *got_frame,
|
|
AVPacket *avpkt)
|
|
{
|
|
AVFrame *frame = data;
|
|
int ret = 0;
|
|
|
|
if ((ret = ffmmal_add_packet(avctx, avpkt)) < 0)
|
|
return ret;
|
|
|
|
if ((ret = ffmmal_fill_input_port(avctx)) < 0)
|
|
return ret;
|
|
|
|
if ((ret = ffmmal_fill_output_port(avctx)) < 0)
|
|
return ret;
|
|
|
|
if ((ret = ffmmal_read_frame(avctx, frame, got_frame)) < 0)
|
|
return ret;
|
|
|
|
// ffmmal_read_frame() can block for a while. Since the decoder is
|
|
// asynchronous, it's a good idea to fill the ports again.
|
|
|
|
if ((ret = ffmmal_fill_output_port(avctx)) < 0)
|
|
return ret;
|
|
|
|
if ((ret = ffmmal_fill_input_port(avctx)) < 0)
|
|
return ret;
|
|
|
|
return ret;
|
|
}
|
|
|
|
AVHWAccel ff_h264_mmal_hwaccel = {
|
|
.name = "h264_mmal",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_H264,
|
|
.pix_fmt = AV_PIX_FMT_MMAL,
|
|
};
|
|
|
|
static const AVOption options[]={
|
|
{"extra_buffers", "extra buffers", offsetof(MMALDecodeContext, extra_buffers), AV_OPT_TYPE_INT, {.i64 = 10}, 0, 256, 0},
|
|
{NULL}
|
|
};
|
|
|
|
static const AVClass ffmmaldec_class = {
|
|
.class_name = "mmaldec",
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVCodec ff_h264_mmal_decoder = {
|
|
.name = "h264_mmal",
|
|
.long_name = NULL_IF_CONFIG_SMALL("h264 (mmal)"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_H264,
|
|
.priv_data_size = sizeof(MMALDecodeContext),
|
|
.init = ffmmal_init_decoder,
|
|
.close = ffmmal_close_decoder,
|
|
.decode = ffmmal_decode,
|
|
.flush = ffmmal_flush,
|
|
.priv_class = &ffmmaldec_class,
|
|
.capabilities = AV_CODEC_CAP_DELAY,
|
|
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MMAL,
|
|
AV_PIX_FMT_YUV420P,
|
|
AV_PIX_FMT_NONE},
|
|
};
|