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FFmpeg/libavcodec/encode.c
James Almer 0271098e6c avcodec/encode: unref the packet on AVCodec.receive_packet() failure 
Fixes memleaks with some encoders that don't unref the packet before
returning.
This is consistent with the behavior of AVCodec.encode()
implementations in encode_simple_internal().

Found-by: mkver
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: James Almer <jamrial@gmail.com>
2020-09-01 10:05:05 -03:00

459 lines
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/*
* generic encoding-related code
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/frame.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/samplefmt.h"
#include "avcodec.h"
#include "encode.h"
#include "frame_thread_encoder.h"
#include "internal.h"
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
{
if (size < 0 || size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
av_log(avctx, AV_LOG_ERROR, "Invalid minimum required packet size %"PRId64" (max allowed is %d)\n",
size, INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE);
return AVERROR(EINVAL);
}
av_assert0(!avpkt->data);
if (avctx && 2*min_size < size) { // FIXME The factor needs to be finetuned
av_fast_padded_malloc(&avctx->internal->byte_buffer, &avctx->internal->byte_buffer_size, size);
avpkt->data = avctx->internal->byte_buffer;
avpkt->size = size;
}
if (!avpkt->data) {
int ret = av_new_packet(avpkt, size);
if (ret < 0)
av_log(avctx, AV_LOG_ERROR, "Failed to allocate packet of size %"PRId64"\n", size);
return ret;
}
return 0;
}
/**
* Pad last frame with silence.
*/
static int pad_last_frame(AVCodecContext *s, AVFrame *frame, const AVFrame *src)
{
int ret;
frame->format = src->format;
frame->channel_layout = src->channel_layout;
frame->channels = src->channels;
frame->nb_samples = s->frame_size;
ret = av_frame_get_buffer(frame, 0);
if (ret < 0)
goto fail;
ret = av_frame_copy_props(frame, src);
if (ret < 0)
goto fail;
if ((ret = av_samples_copy(frame->extended_data, src->extended_data, 0, 0,
src->nb_samples, s->channels, s->sample_fmt)) < 0)
goto fail;
if ((ret = av_samples_set_silence(frame->extended_data, src->nb_samples,
frame->nb_samples - src->nb_samples,
s->channels, s->sample_fmt)) < 0)
goto fail;
return 0;
fail:
av_frame_unref(frame);
return ret;
}
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
const AVSubtitle *sub)
{
int ret;
if (sub->start_display_time) {
av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");
return -1;
}
ret = avctx->codec->encode_sub(avctx, buf, buf_size, sub);
avctx->frame_number++;
return ret;
}
int ff_encode_get_frame(AVCodecContext *avctx, AVFrame *frame)
{
AVCodecInternal *avci = avctx->internal;
if (avci->draining)
return AVERROR_EOF;
if (!avci->buffer_frame->buf[0])
return AVERROR(EAGAIN);
av_frame_move_ref(frame, avci->buffer_frame);
return 0;
}
static int encode_simple_internal(AVCodecContext *avctx, AVPacket *avpkt)
{
AVCodecInternal *avci = avctx->internal;
EncodeSimpleContext *es = &avci->es;
AVFrame *frame = es->in_frame;
int got_packet;
int ret;
if (avci->draining_done)
return AVERROR_EOF;
if (!frame->buf[0] && !avci->draining) {
av_frame_unref(frame);
ret = ff_encode_get_frame(avctx, frame);
if (ret < 0 && ret != AVERROR_EOF)
return ret;
}
if (!frame->buf[0]) {
if (!(avctx->codec->capabilities & AV_CODEC_CAP_DELAY ||
(avci->frame_thread_encoder && avctx->active_thread_type & FF_THREAD_FRAME)))
return AVERROR_EOF;
// Flushing is signaled with a NULL frame
frame = NULL;
}
got_packet = 0;
av_assert0(avctx->codec->encode2);
if (CONFIG_FRAME_THREAD_ENCODER &&
avci->frame_thread_encoder && (avctx->active_thread_type & FF_THREAD_FRAME))
ret = ff_thread_video_encode_frame(avctx, avpkt, frame, &got_packet);
else {
ret = avctx->codec->encode2(avctx, avpkt, frame, &got_packet);
if (avctx->codec->type == AVMEDIA_TYPE_VIDEO && !ret && got_packet &&
!(avctx->codec->capabilities & AV_CODEC_CAP_DELAY))
avpkt->pts = avpkt->dts = frame->pts;
}
av_assert0(ret <= 0);
emms_c();
if (!ret && got_packet) {
if (avpkt->data) {
ret = av_packet_make_refcounted(avpkt);
if (ret < 0)
goto end;
}
if (frame && !(avctx->codec->capabilities & AV_CODEC_CAP_DELAY)) {
if (avctx->codec->type == AVMEDIA_TYPE_AUDIO) {
if (avpkt->pts == AV_NOPTS_VALUE)
avpkt->pts = frame->pts;
if (!avpkt->duration)
avpkt->duration = ff_samples_to_time_base(avctx,
frame->nb_samples);
}
}
if (avctx->codec->type == AVMEDIA_TYPE_AUDIO) {
/* NOTE: if we add any audio encoders which output non-keyframe packets,
* this needs to be moved to the encoders, but for now we can do it
* here to simplify things */
avpkt->flags |= AV_PKT_FLAG_KEY;
avpkt->dts = avpkt->pts;
}
}
if (avci->draining && !got_packet)
avci->draining_done = 1;
end:
if (ret < 0 || !got_packet)
av_packet_unref(avpkt);
if (frame) {
if (!ret)
avctx->frame_number++;
av_frame_unref(frame);
}
if (got_packet)
// Encoders must always return ref-counted buffers.
// Side-data only packets have no data and can be not ref-counted.
av_assert0(!avpkt->data || avpkt->buf);
return ret;
}
static int encode_simple_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
{
int ret;
while (!avpkt->data && !avpkt->side_data) {
ret = encode_simple_internal(avctx, avpkt);
if (ret < 0)
return ret;
}
return 0;
}
static int encode_receive_packet_internal(AVCodecContext *avctx, AVPacket *avpkt)
{
AVCodecInternal *avci = avctx->internal;
int ret;
if (avci->draining_done)
return AVERROR_EOF;
av_assert0(!avpkt->data && !avpkt->side_data);
if (avctx->codec->type == AVMEDIA_TYPE_VIDEO) {
if ((avctx->flags & AV_CODEC_FLAG_PASS1) && avctx->stats_out)
avctx->stats_out[0] = '\0';
if (av_image_check_size2(avctx->width, avctx->height, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx))
return AVERROR(EINVAL);
}
if (avctx->codec->receive_packet) {
ret = avctx->codec->receive_packet(avctx, avpkt);
if (ret < 0)
av_packet_unref(avpkt);
else
// Encoders must always return ref-counted buffers.
// Side-data only packets have no data and can be not ref-counted.
av_assert0(!avpkt->data || avpkt->buf);
} else
ret = encode_simple_receive_packet(avctx, avpkt);
if (ret == AVERROR_EOF)
avci->draining_done = 1;
return ret;
}
static int encode_send_frame_internal(AVCodecContext *avctx, const AVFrame *src)
{
AVCodecInternal *avci = avctx->internal;
AVFrame *dst = avci->buffer_frame;
int ret;
if (avctx->codec->type == AVMEDIA_TYPE_AUDIO) {
/* extract audio service type metadata */
AVFrameSideData *sd = av_frame_get_side_data(src, AV_FRAME_DATA_AUDIO_SERVICE_TYPE);
if (sd && sd->size >= sizeof(enum AVAudioServiceType))
avctx->audio_service_type = *(enum AVAudioServiceType*)sd->data;
/* check for valid frame size */
if (avctx->codec->capabilities & AV_CODEC_CAP_SMALL_LAST_FRAME) {
if (src->nb_samples > avctx->frame_size) {
av_log(avctx, AV_LOG_ERROR, "more samples than frame size\n");
return AVERROR(EINVAL);
}
} else if (!(avctx->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE)) {
/* if we already got an undersized frame, that must have been the last */
if (avctx->internal->last_audio_frame) {
av_log(avctx, AV_LOG_ERROR, "frame_size (%d) was not respected for a non-last frame\n", avctx->frame_size);
return AVERROR(EINVAL);
}
if (src->nb_samples < avctx->frame_size) {
ret = pad_last_frame(avctx, dst, src);
if (ret < 0)
return ret;
avctx->internal->last_audio_frame = 1;
} else if (src->nb_samples > avctx->frame_size) {
av_log(avctx, AV_LOG_ERROR, "nb_samples (%d) != frame_size (%d)\n", src->nb_samples, avctx->frame_size);
return AVERROR(EINVAL);
}
}
}
if (!dst->data[0]) {
ret = av_frame_ref(dst, src);
if (ret < 0)
return ret;
}
return 0;
}
int attribute_align_arg avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)
{
AVCodecInternal *avci = avctx->internal;
int ret;
if (!avcodec_is_open(avctx) || !av_codec_is_encoder(avctx->codec))
return AVERROR(EINVAL);
if (avci->draining)
return AVERROR_EOF;
if (avci->buffer_frame->data[0])
return AVERROR(EAGAIN);
if (!frame) {
avci->draining = 1;
} else {
ret = encode_send_frame_internal(avctx, frame);
if (ret < 0)
return ret;
}
if (!avci->buffer_pkt->data && !avci->buffer_pkt->side_data) {
ret = encode_receive_packet_internal(avctx, avci->buffer_pkt);
if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
return ret;
}
return 0;
}
int attribute_align_arg avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
{
AVCodecInternal *avci = avctx->internal;
int ret;
av_packet_unref(avpkt);
if (!avcodec_is_open(avctx) || !av_codec_is_encoder(avctx->codec))
return AVERROR(EINVAL);
if (avci->buffer_pkt->data || avci->buffer_pkt->side_data) {
av_packet_move_ref(avpkt, avci->buffer_pkt);
} else {
ret = encode_receive_packet_internal(avctx, avpkt);
if (ret < 0)
return ret;
}
return 0;
}
static int compat_encode(AVCodecContext *avctx, AVPacket *avpkt,
int *got_packet, const AVFrame *frame)
{
AVCodecInternal *avci = avctx->internal;
AVPacket user_pkt;
int ret;
*got_packet = 0;
if (frame && avctx->codec->type == AVMEDIA_TYPE_VIDEO) {
if (frame->format == AV_PIX_FMT_NONE)
av_log(avctx, AV_LOG_WARNING, "AVFrame.format is not set\n");
if (frame->width == 0 || frame->height == 0)
av_log(avctx, AV_LOG_WARNING, "AVFrame.width or height is not set\n");
}
ret = avcodec_send_frame(avctx, frame);
if (ret == AVERROR_EOF)
ret = 0;
else if (ret == AVERROR(EAGAIN)) {
/* we fully drain all the output in each encode call, so this should not
* ever happen */
return AVERROR_BUG;
} else if (ret < 0)
return ret;
av_packet_move_ref(&user_pkt, avpkt);
while (ret >= 0) {
ret = avcodec_receive_packet(avctx, avpkt);
if (ret < 0) {
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
ret = 0;
goto finish;
}
if (avpkt != avci->compat_encode_packet) {
if (avpkt->data && user_pkt.data) {
if (user_pkt.size >= avpkt->size) {
memcpy(user_pkt.data, avpkt->data, avpkt->size);
av_buffer_unref(&avpkt->buf);
avpkt->buf = user_pkt.buf;
avpkt->data = user_pkt.data;
av_init_packet(&user_pkt);
} else {
av_log(avctx, AV_LOG_ERROR, "Provided packet is too small, needs to be %d\n", avpkt->size);
av_packet_unref(avpkt);
ret = AVERROR(EINVAL);
goto finish;
}
}
*got_packet = 1;
avpkt = avci->compat_encode_packet;
} else {
if (!avci->compat_decode_warned) {
av_log(avctx, AV_LOG_WARNING, "The deprecated avcodec_encode_* "
"API cannot return all the packets for this encoder. "
"Some packets will be dropped. Update your code to the "
"new encoding API to fix this.\n");
avci->compat_decode_warned = 1;
av_packet_unref(avpkt);
}
}
if (avci->draining)
break;
}
finish:
if (ret < 0)
av_packet_unref(&user_pkt);
return ret;
}
int attribute_align_arg avcodec_encode_audio2(AVCodecContext *avctx,
AVPacket *avpkt,
const AVFrame *frame,
int *got_packet_ptr)
{
int ret = compat_encode(avctx, avpkt, got_packet_ptr, frame);
if (ret < 0)
av_packet_unref(avpkt);
return ret;
}
int attribute_align_arg avcodec_encode_video2(AVCodecContext *avctx,
AVPacket *avpkt,
const AVFrame *frame,
int *got_packet_ptr)
{
int ret = compat_encode(avctx, avpkt, got_packet_ptr, frame);
if (ret < 0)
av_packet_unref(avpkt);
return ret;
}
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