mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
48bb0da050
Deprecated in 08/2014.
357 lines
11 KiB
C
357 lines
11 KiB
C
/*
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* generic encoding-related code
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#include "libavutil/attributes.h"
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#include "libavutil/avassert.h"
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#include "libavutil/frame.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/samplefmt.h"
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#include "avcodec.h"
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#include "internal.h"
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int ff_alloc_packet(AVPacket *avpkt, int size)
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{
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if (size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
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return AVERROR(EINVAL);
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if (avpkt->data) {
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AVBufferRef *buf = avpkt->buf;
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if (avpkt->size < size)
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return AVERROR(EINVAL);
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av_init_packet(avpkt);
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avpkt->buf = buf;
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avpkt->size = size;
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return 0;
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} else {
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return av_new_packet(avpkt, size);
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}
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}
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/**
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* Pad last frame with silence.
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*/
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static int pad_last_frame(AVCodecContext *s, AVFrame **dst, const AVFrame *src)
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{
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AVFrame *frame = NULL;
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int ret;
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if (!(frame = av_frame_alloc()))
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return AVERROR(ENOMEM);
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frame->format = src->format;
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frame->channel_layout = src->channel_layout;
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frame->nb_samples = s->frame_size;
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ret = av_frame_get_buffer(frame, 32);
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if (ret < 0)
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goto fail;
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ret = av_frame_copy_props(frame, src);
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if (ret < 0)
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goto fail;
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if ((ret = av_samples_copy(frame->extended_data, src->extended_data, 0, 0,
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src->nb_samples, s->channels, s->sample_fmt)) < 0)
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goto fail;
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if ((ret = av_samples_set_silence(frame->extended_data, src->nb_samples,
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frame->nb_samples - src->nb_samples,
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s->channels, s->sample_fmt)) < 0)
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goto fail;
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*dst = frame;
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return 0;
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fail:
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av_frame_free(&frame);
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return ret;
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}
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int attribute_align_arg avcodec_encode_audio2(AVCodecContext *avctx,
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AVPacket *avpkt,
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const AVFrame *frame,
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int *got_packet_ptr)
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{
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AVFrame tmp;
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AVFrame *padded_frame = NULL;
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int ret;
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int user_packet = !!avpkt->data;
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*got_packet_ptr = 0;
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if (!avctx->codec->encode2) {
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av_log(avctx, AV_LOG_ERROR, "This encoder requires using the avcodec_send_frame() API.\n");
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return AVERROR(ENOSYS);
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}
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if (!(avctx->codec->capabilities & AV_CODEC_CAP_DELAY) && !frame) {
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av_packet_unref(avpkt);
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av_init_packet(avpkt);
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return 0;
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}
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/* ensure that extended_data is properly set */
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if (frame && !frame->extended_data) {
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if (av_sample_fmt_is_planar(avctx->sample_fmt) &&
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avctx->channels > AV_NUM_DATA_POINTERS) {
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av_log(avctx, AV_LOG_ERROR, "Encoding to a planar sample format, "
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"with more than %d channels, but extended_data is not set.\n",
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AV_NUM_DATA_POINTERS);
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return AVERROR(EINVAL);
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}
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av_log(avctx, AV_LOG_WARNING, "extended_data is not set.\n");
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tmp = *frame;
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tmp.extended_data = tmp.data;
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frame = &tmp;
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}
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/* extract audio service type metadata */
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if (frame) {
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AVFrameSideData *sd = av_frame_get_side_data(frame, AV_FRAME_DATA_AUDIO_SERVICE_TYPE);
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if (sd && sd->size >= sizeof(enum AVAudioServiceType))
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avctx->audio_service_type = *(enum AVAudioServiceType*)sd->data;
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}
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/* check for valid frame size */
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if (frame) {
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if (avctx->codec->capabilities & AV_CODEC_CAP_SMALL_LAST_FRAME) {
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if (frame->nb_samples > avctx->frame_size)
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return AVERROR(EINVAL);
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} else if (!(avctx->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE)) {
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if (frame->nb_samples < avctx->frame_size &&
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!avctx->internal->last_audio_frame) {
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ret = pad_last_frame(avctx, &padded_frame, frame);
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if (ret < 0)
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return ret;
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frame = padded_frame;
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avctx->internal->last_audio_frame = 1;
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}
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if (frame->nb_samples != avctx->frame_size) {
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ret = AVERROR(EINVAL);
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goto end;
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}
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}
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}
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ret = avctx->codec->encode2(avctx, avpkt, frame, got_packet_ptr);
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if (!ret) {
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if (*got_packet_ptr) {
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if (!(avctx->codec->capabilities & AV_CODEC_CAP_DELAY)) {
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if (avpkt->pts == AV_NOPTS_VALUE)
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avpkt->pts = frame->pts;
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if (!avpkt->duration)
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avpkt->duration = ff_samples_to_time_base(avctx,
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frame->nb_samples);
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}
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avpkt->dts = avpkt->pts;
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} else {
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avpkt->size = 0;
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}
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if (!user_packet && avpkt->size) {
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ret = av_buffer_realloc(&avpkt->buf, avpkt->size);
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if (ret >= 0)
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avpkt->data = avpkt->buf->data;
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}
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avctx->frame_number++;
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}
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if (ret < 0 || !*got_packet_ptr) {
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av_packet_unref(avpkt);
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av_init_packet(avpkt);
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goto end;
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}
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/* NOTE: if we add any audio encoders which output non-keyframe packets,
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* this needs to be moved to the encoders, but for now we can do it
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* here to simplify things */
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avpkt->flags |= AV_PKT_FLAG_KEY;
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end:
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av_frame_free(&padded_frame);
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return ret;
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}
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int attribute_align_arg avcodec_encode_video2(AVCodecContext *avctx,
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AVPacket *avpkt,
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const AVFrame *frame,
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int *got_packet_ptr)
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{
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int ret;
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int user_packet = !!avpkt->data;
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*got_packet_ptr = 0;
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if (!avctx->codec->encode2) {
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av_log(avctx, AV_LOG_ERROR, "This encoder requires using the avcodec_send_frame() API.\n");
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return AVERROR(ENOSYS);
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}
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if (!(avctx->codec->capabilities & AV_CODEC_CAP_DELAY) && !frame) {
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av_packet_unref(avpkt);
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av_init_packet(avpkt);
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avpkt->size = 0;
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return 0;
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}
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if (av_image_check_size(avctx->width, avctx->height, 0, avctx))
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return AVERROR(EINVAL);
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av_assert0(avctx->codec->encode2);
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ret = avctx->codec->encode2(avctx, avpkt, frame, got_packet_ptr);
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if (!ret) {
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if (!*got_packet_ptr)
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avpkt->size = 0;
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else if (!(avctx->codec->capabilities & AV_CODEC_CAP_DELAY))
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avpkt->pts = avpkt->dts = frame->pts;
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if (!user_packet && avpkt->size) {
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ret = av_buffer_realloc(&avpkt->buf, avpkt->size);
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if (ret >= 0)
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avpkt->data = avpkt->buf->data;
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}
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avctx->frame_number++;
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}
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if (ret < 0 || !*got_packet_ptr)
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av_packet_unref(avpkt);
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emms_c();
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return ret;
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}
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int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
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const AVSubtitle *sub)
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{
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int ret;
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if (sub->start_display_time) {
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av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");
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return -1;
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}
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if (sub->num_rects == 0 || !sub->rects)
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return -1;
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ret = avctx->codec->encode_sub(avctx, buf, buf_size, sub);
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avctx->frame_number++;
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return ret;
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}
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static int do_encode(AVCodecContext *avctx, const AVFrame *frame, int *got_packet)
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{
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int ret;
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*got_packet = 0;
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av_packet_unref(avctx->internal->buffer_pkt);
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avctx->internal->buffer_pkt_valid = 0;
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if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
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ret = avcodec_encode_video2(avctx, avctx->internal->buffer_pkt,
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frame, got_packet);
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} else if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
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ret = avcodec_encode_audio2(avctx, avctx->internal->buffer_pkt,
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frame, got_packet);
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} else {
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ret = AVERROR(EINVAL);
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}
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if (ret >= 0 && *got_packet) {
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// Encoders must always return ref-counted buffers.
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// Side-data only packets have no data and can be not ref-counted.
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av_assert0(!avctx->internal->buffer_pkt->data || avctx->internal->buffer_pkt->buf);
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avctx->internal->buffer_pkt_valid = 1;
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ret = 0;
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} else {
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av_packet_unref(avctx->internal->buffer_pkt);
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}
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return ret;
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}
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int attribute_align_arg avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)
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{
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if (!avcodec_is_open(avctx) || !av_codec_is_encoder(avctx->codec))
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return AVERROR(EINVAL);
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if (avctx->internal->draining)
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return AVERROR_EOF;
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if (!frame) {
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avctx->internal->draining = 1;
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if (!(avctx->codec->capabilities & AV_CODEC_CAP_DELAY))
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return 0;
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}
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if (avctx->codec->send_frame)
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return avctx->codec->send_frame(avctx, frame);
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// Emulation via old API. Do it here instead of avcodec_receive_packet, because:
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// 1. if the AVFrame is not refcounted, the copying will be much more
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// expensive than copying the packet data
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// 2. assume few users use non-refcounted AVPackets, so usually no copy is
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// needed
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if (avctx->internal->buffer_pkt_valid)
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return AVERROR(EAGAIN);
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return do_encode(avctx, frame, &(int){0});
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}
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int attribute_align_arg avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
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{
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av_packet_unref(avpkt);
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if (!avcodec_is_open(avctx) || !av_codec_is_encoder(avctx->codec))
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return AVERROR(EINVAL);
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if (avctx->codec->receive_packet) {
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if (avctx->internal->draining && !(avctx->codec->capabilities & AV_CODEC_CAP_DELAY))
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return AVERROR_EOF;
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return avctx->codec->receive_packet(avctx, avpkt);
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}
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// Emulation via old API.
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if (!avctx->internal->buffer_pkt_valid) {
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int got_packet;
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int ret;
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if (!avctx->internal->draining)
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return AVERROR(EAGAIN);
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ret = do_encode(avctx, NULL, &got_packet);
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if (ret < 0)
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return ret;
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if (ret >= 0 && !got_packet)
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return AVERROR_EOF;
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}
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av_packet_move_ref(avpkt, avctx->internal->buffer_pkt);
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avctx->internal->buffer_pkt_valid = 0;
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return 0;
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}
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