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ffmpeg/libavcodec/decode.c
Anton Khirnov f566032bfd lavc/decode: validate frames output by decoders 
Make sure no frames with invalid parameters will be seen by the caller.
2023-01-10 11:47:29 +01:00

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/*
* generic decoding-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 <stdint.h>
#include <string.h>
#include "config.h"
#if CONFIG_ICONV
# include <iconv.h>
#endif
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/fifo.h"
#include "libavutil/frame.h"
#include "libavutil/hwcontext.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/intmath.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bytestream.h"
#include "bsf.h"
#include "codec_internal.h"
#include "decode.h"
#include "hwconfig.h"
#include "internal.h"
#include "thread.h"
static int apply_param_change(AVCodecContext *avctx, const AVPacket *avpkt)
{
int ret;
size_t size;
const uint8_t *data;
uint32_t flags;
int64_t val;
data = av_packet_get_side_data(avpkt, AV_PKT_DATA_PARAM_CHANGE, &size);
if (!data)
return 0;
if (!(avctx->codec->capabilities & AV_CODEC_CAP_PARAM_CHANGE)) {
av_log(avctx, AV_LOG_ERROR, "This decoder does not support parameter "
"changes, but PARAM_CHANGE side data was sent to it.\n");
ret = AVERROR(EINVAL);
goto fail2;
}
if (size < 4)
goto fail;
flags = bytestream_get_le32(&data);
size -= 4;
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) {
if (size < 4)
goto fail;
val = bytestream_get_le32(&data);
if (val <= 0 || val > INT_MAX) {
av_log(avctx, AV_LOG_ERROR, "Invalid channel count");
ret = AVERROR_INVALIDDATA;
goto fail2;
}
avctx->channels = val;
size -= 4;
}
if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) {
if (size < 8)
goto fail;
avctx->channel_layout = bytestream_get_le64(&data);
size -= 8;
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) {
if (size < 4)
goto fail;
val = bytestream_get_le32(&data);
if (val <= 0 || val > INT_MAX) {
av_log(avctx, AV_LOG_ERROR, "Invalid sample rate");
ret = AVERROR_INVALIDDATA;
goto fail2;
}
avctx->sample_rate = val;
size -= 4;
}
if (flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) {
if (size < 8)
goto fail;
avctx->width = bytestream_get_le32(&data);
avctx->height = bytestream_get_le32(&data);
size -= 8;
ret = ff_set_dimensions(avctx, avctx->width, avctx->height);
if (ret < 0)
goto fail2;
}
return 0;
fail:
av_log(avctx, AV_LOG_ERROR, "PARAM_CHANGE side data too small.\n");
ret = AVERROR_INVALIDDATA;
fail2:
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error applying parameter changes.\n");
if (avctx->err_recognition & AV_EF_EXPLODE)
return ret;
}
return 0;
}
static int extract_packet_props(AVCodecInternal *avci, const AVPacket *pkt)
{
int ret = 0;
av_packet_unref(avci->last_pkt_props);
if (pkt) {
ret = av_packet_copy_props(avci->last_pkt_props, pkt);
if (!ret)
avci->last_pkt_props->opaque = (void *)(intptr_t)pkt->size; // Needed for ff_decode_frame_props().
}
return ret;
}
static int decode_bsfs_init(AVCodecContext *avctx)
{
AVCodecInternal *avci = avctx->internal;
const FFCodec *const codec = ffcodec(avctx->codec);
int ret;
if (avci->bsf)
return 0;
ret = av_bsf_list_parse_str(codec->bsfs, &avci->bsf);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error parsing decoder bitstream filters '%s': %s\n", codec->bsfs, av_err2str(ret));
if (ret != AVERROR(ENOMEM))
ret = AVERROR_BUG;
goto fail;
}
/* We do not currently have an API for passing the input timebase into decoders,
* but no filters used here should actually need it.
* So we make up some plausible-looking number (the MPEG 90kHz timebase) */
avci->bsf->time_base_in = (AVRational){ 1, 90000 };
ret = avcodec_parameters_from_context(avci->bsf->par_in, avctx);
if (ret < 0)
goto fail;
ret = av_bsf_init(avci->bsf);
if (ret < 0)
goto fail;
return 0;
fail:
av_bsf_free(&avci->bsf);
return ret;
}
int ff_decode_get_packet(AVCodecContext *avctx, AVPacket *pkt)
{
AVCodecInternal *avci = avctx->internal;
int ret;
if (avci->draining)
return AVERROR_EOF;
ret = av_bsf_receive_packet(avci->bsf, pkt);
if (ret == AVERROR_EOF)
avci->draining = 1;
if (ret < 0)
return ret;
if (!(ffcodec(avctx->codec)->caps_internal & FF_CODEC_CAP_SETS_FRAME_PROPS)) {
ret = extract_packet_props(avctx->internal, pkt);
if (ret < 0)
goto finish;
}
ret = apply_param_change(avctx, pkt);
if (ret < 0)
goto finish;
return 0;
finish:
av_packet_unref(pkt);
return ret;
}
/**
* Attempt to guess proper monotonic timestamps for decoded video frames
* which might have incorrect times. Input timestamps may wrap around, in
* which case the output will as well.
*
* @param pts the pts field of the decoded AVPacket, as passed through
* AVFrame.pts
* @param dts the dts field of the decoded AVPacket
* @return one of the input values, may be AV_NOPTS_VALUE
*/
static int64_t guess_correct_pts(AVCodecContext *ctx,
int64_t reordered_pts, int64_t dts)
{
int64_t pts = AV_NOPTS_VALUE;
if (dts != AV_NOPTS_VALUE) {
ctx->pts_correction_num_faulty_dts += dts <= ctx->pts_correction_last_dts;
ctx->pts_correction_last_dts = dts;
} else if (reordered_pts != AV_NOPTS_VALUE)
ctx->pts_correction_last_dts = reordered_pts;
if (reordered_pts != AV_NOPTS_VALUE) {
ctx->pts_correction_num_faulty_pts += reordered_pts <= ctx->pts_correction_last_pts;
ctx->pts_correction_last_pts = reordered_pts;
} else if(dts != AV_NOPTS_VALUE)
ctx->pts_correction_last_pts = dts;
if ((ctx->pts_correction_num_faulty_pts<=ctx->pts_correction_num_faulty_dts || dts == AV_NOPTS_VALUE)
&& reordered_pts != AV_NOPTS_VALUE)
pts = reordered_pts;
else
pts = dts;
return pts;
}
/*
* The core of the receive_frame_wrapper for the decoders implementing
* the simple API. Certain decoders might consume partial packets without
* returning any output, so this function needs to be called in a loop until it
* returns EAGAIN.
**/
static inline int decode_simple_internal(AVCodecContext *avctx, AVFrame *frame, int64_t *discarded_samples)
{
AVCodecInternal *avci = avctx->internal;
AVPacket *const pkt = avci->in_pkt;
const FFCodec *const codec = ffcodec(avctx->codec);
int got_frame, actual_got_frame;
int ret;
if (!pkt->data && !avci->draining) {
av_packet_unref(pkt);
ret = ff_decode_get_packet(avctx, pkt);
if (ret < 0 && ret != AVERROR_EOF)
return ret;
}
// Some codecs (at least wma lossless) will crash when feeding drain packets
// after EOF was signaled.
if (avci->draining_done)
return AVERROR_EOF;
if (!pkt->data &&
!(avctx->codec->capabilities & AV_CODEC_CAP_DELAY ||
avctx->active_thread_type & FF_THREAD_FRAME))
return AVERROR_EOF;
got_frame = 0;
if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME) {
ret = ff_thread_decode_frame(avctx, frame, &got_frame, pkt);
} else {
ret = codec->cb.decode(avctx, frame, &got_frame, pkt);
if (!(codec->caps_internal & FF_CODEC_CAP_SETS_PKT_DTS))
frame->pkt_dts = pkt->dts;
if (avctx->codec->type == AVMEDIA_TYPE_VIDEO) {
if(!avctx->has_b_frames)
frame->pkt_pos = pkt->pos;
//FIXME these should be under if(!avctx->has_b_frames)
/* get_buffer is supposed to set frame parameters */
if (!(avctx->codec->capabilities & AV_CODEC_CAP_DR1)) {
if (!frame->sample_aspect_ratio.num) frame->sample_aspect_ratio = avctx->sample_aspect_ratio;
if (!frame->width) frame->width = avctx->width;
if (!frame->height) frame->height = avctx->height;
if (frame->format == AV_PIX_FMT_NONE) frame->format = avctx->pix_fmt;
}
}
}
emms_c();
actual_got_frame = got_frame;
if (avctx->codec->type == AVMEDIA_TYPE_VIDEO) {
if (frame->flags & AV_FRAME_FLAG_DISCARD)
got_frame = 0;
} else if (avctx->codec->type == AVMEDIA_TYPE_AUDIO) {
uint8_t *side;
size_t side_size;
uint32_t discard_padding = 0;
uint8_t skip_reason = 0;
uint8_t discard_reason = 0;
if (ret >= 0 && got_frame) {
if (frame->format == AV_SAMPLE_FMT_NONE)
frame->format = avctx->sample_fmt;
if (!frame->ch_layout.nb_channels) {
int ret2 = av_channel_layout_copy(&frame->ch_layout, &avctx->ch_layout);
if (ret2 < 0) {
ret = ret2;
got_frame = 0;
}
}
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
if (!frame->channel_layout)
frame->channel_layout = avctx->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
avctx->ch_layout.u.mask : 0;
if (!frame->channels)
frame->channels = avctx->ch_layout.nb_channels;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (!frame->sample_rate)
frame->sample_rate = avctx->sample_rate;
}
side= av_packet_get_side_data(avci->last_pkt_props, AV_PKT_DATA_SKIP_SAMPLES, &side_size);
if(side && side_size>=10) {
avci->skip_samples = AV_RL32(side);
avci->skip_samples = FFMAX(0, avci->skip_samples);
discard_padding = AV_RL32(side + 4);
av_log(avctx, AV_LOG_DEBUG, "skip %d / discard %d samples due to side data\n",
avci->skip_samples, (int)discard_padding);
skip_reason = AV_RL8(side + 8);
discard_reason = AV_RL8(side + 9);
}
if ((frame->flags & AV_FRAME_FLAG_DISCARD) && got_frame &&
!(avctx->flags2 & AV_CODEC_FLAG2_SKIP_MANUAL)) {
avci->skip_samples = FFMAX(0, avci->skip_samples - frame->nb_samples);
got_frame = 0;
*discarded_samples += frame->nb_samples;
}
if (avci->skip_samples > 0 && got_frame &&
!(avctx->flags2 & AV_CODEC_FLAG2_SKIP_MANUAL)) {
if(frame->nb_samples <= avci->skip_samples){
got_frame = 0;
*discarded_samples += frame->nb_samples;
avci->skip_samples -= frame->nb_samples;
av_log(avctx, AV_LOG_DEBUG, "skip whole frame, skip left: %d\n",
avci->skip_samples);
} else {
av_samples_copy(frame->extended_data, frame->extended_data, 0, avci->skip_samples,
frame->nb_samples - avci->skip_samples, avctx->ch_layout.nb_channels, frame->format);
if(avctx->pkt_timebase.num && avctx->sample_rate) {
int64_t diff_ts = av_rescale_q(avci->skip_samples,
(AVRational){1, avctx->sample_rate},
avctx->pkt_timebase);
if(frame->pts!=AV_NOPTS_VALUE)
frame->pts += diff_ts;
if(frame->pkt_dts!=AV_NOPTS_VALUE)
frame->pkt_dts += diff_ts;
if (frame->duration >= diff_ts)
frame->duration -= diff_ts;
} else {
av_log(avctx, AV_LOG_WARNING, "Could not update timestamps for skipped samples.\n");
}
av_log(avctx, AV_LOG_DEBUG, "skip %d/%d samples\n",
avci->skip_samples, frame->nb_samples);
*discarded_samples += avci->skip_samples;
frame->nb_samples -= avci->skip_samples;
avci->skip_samples = 0;
}
}
if (discard_padding > 0 && discard_padding <= frame->nb_samples && got_frame &&
!(avctx->flags2 & AV_CODEC_FLAG2_SKIP_MANUAL)) {
if (discard_padding == frame->nb_samples) {
*discarded_samples += frame->nb_samples;
got_frame = 0;
} else {
if(avctx->pkt_timebase.num && avctx->sample_rate) {
int64_t diff_ts = av_rescale_q(frame->nb_samples - discard_padding,
(AVRational){1, avctx->sample_rate},
avctx->pkt_timebase);
frame->duration = diff_ts;
} else {
av_log(avctx, AV_LOG_WARNING, "Could not update timestamps for discarded samples.\n");
}
av_log(avctx, AV_LOG_DEBUG, "discard %d/%d samples\n",
(int)discard_padding, frame->nb_samples);
frame->nb_samples -= discard_padding;
}
}
if ((avctx->flags2 & AV_CODEC_FLAG2_SKIP_MANUAL) && got_frame) {
AVFrameSideData *fside = av_frame_new_side_data(frame, AV_FRAME_DATA_SKIP_SAMPLES, 10);
if (fside) {
AV_WL32(fside->data, avci->skip_samples);
AV_WL32(fside->data + 4, discard_padding);
AV_WL8(fside->data + 8, skip_reason);
AV_WL8(fside->data + 9, discard_reason);
avci->skip_samples = 0;
}
}
}
if (avctx->codec->type == AVMEDIA_TYPE_AUDIO &&
!avci->showed_multi_packet_warning &&
ret >= 0 && ret != pkt->size && !(avctx->codec->capabilities & AV_CODEC_CAP_SUBFRAMES)) {
av_log(avctx, AV_LOG_WARNING, "Multiple frames in a packet.\n");
avci->showed_multi_packet_warning = 1;
}
if (!got_frame)
av_frame_unref(frame);
#if FF_API_FLAG_TRUNCATED
if (ret >= 0 && avctx->codec->type == AVMEDIA_TYPE_VIDEO && !(avctx->flags & AV_CODEC_FLAG_TRUNCATED))
#else
if (ret >= 0 && avctx->codec->type == AVMEDIA_TYPE_VIDEO)
#endif
ret = pkt->size;
#if FF_API_AVCTX_TIMEBASE
if (avctx->framerate.num > 0 && avctx->framerate.den > 0)
avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
#endif
/* do not stop draining when actual_got_frame != 0 or ret < 0 */
/* got_frame == 0 but actual_got_frame != 0 when frame is discarded */
if (avci->draining && !actual_got_frame) {
if (ret < 0) {
/* prevent infinite loop if a decoder wrongly always return error on draining */
/* reasonable nb_errors_max = maximum b frames + thread count */
int nb_errors_max = 20 + (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME ?
avctx->thread_count : 1);
if (avci->nb_draining_errors++ >= nb_errors_max) {
av_log(avctx, AV_LOG_ERROR, "Too many errors when draining, this is a bug. "
"Stop draining and force EOF.\n");
avci->draining_done = 1;
ret = AVERROR_BUG;
}
} else {
avci->draining_done = 1;
}
}
if (ret >= pkt->size || ret < 0) {
av_packet_unref(pkt);
} else {
int consumed = ret;
pkt->data += consumed;
pkt->size -= consumed;
pkt->pts = AV_NOPTS_VALUE;
pkt->dts = AV_NOPTS_VALUE;
if (!(codec->caps_internal & FF_CODEC_CAP_SETS_FRAME_PROPS)) {
// See extract_packet_props() comment.
avci->last_pkt_props->opaque = (void *)((intptr_t)avci->last_pkt_props->opaque - consumed);
avci->last_pkt_props->pts = AV_NOPTS_VALUE;
avci->last_pkt_props->dts = AV_NOPTS_VALUE;
}
}
if (got_frame)
av_assert0(frame->buf[0]);
return ret < 0 ? ret : 0;
}
#if CONFIG_LCMS2
static int detect_colorspace(AVCodecContext *avctx, AVFrame *frame)
{
AVCodecInternal *avci = avctx->internal;
enum AVColorTransferCharacteristic trc;
AVColorPrimariesDesc coeffs;
enum AVColorPrimaries prim;
cmsHPROFILE profile;
AVFrameSideData *sd;
int ret;
if (!(avctx->flags2 & AV_CODEC_FLAG2_ICC_PROFILES))
return 0;
sd = av_frame_get_side_data(frame, AV_FRAME_DATA_ICC_PROFILE);
if (!sd || !sd->size)
return 0;
if (!avci->icc.avctx) {
ret = ff_icc_context_init(&avci->icc, avctx);
if (ret < 0)
return ret;
}
profile = cmsOpenProfileFromMemTHR(avci->icc.ctx, sd->data, sd->size);
if (!profile)
return AVERROR_INVALIDDATA;
ret = ff_icc_profile_read_primaries(&avci->icc, profile, &coeffs);
if (!ret)
ret = ff_icc_profile_detect_transfer(&avci->icc, profile, &trc);
cmsCloseProfile(profile);
if (ret < 0)
return ret;
prim = av_csp_primaries_id_from_desc(&coeffs);
if (prim != AVCOL_PRI_UNSPECIFIED)
frame->color_primaries = prim;
if (trc != AVCOL_TRC_UNSPECIFIED)
frame->color_trc = trc;
return 0;
}
#else /* !CONFIG_LCMS2 */
static int detect_colorspace(av_unused AVCodecContext *c, av_unused AVFrame *f)
{
return 0;
}
#endif
static int decode_simple_receive_frame(AVCodecContext *avctx, AVFrame *frame)
{
int ret;
int64_t discarded_samples = 0;
while (!frame->buf[0]) {
if (discarded_samples > avctx->max_samples)
return AVERROR(EAGAIN);
ret = decode_simple_internal(avctx, frame, &discarded_samples);
if (ret < 0)
return ret;
}
return 0;
}
static int decode_receive_frame_internal(AVCodecContext *avctx, AVFrame *frame)
{
AVCodecInternal *avci = avctx->internal;
const FFCodec *const codec = ffcodec(avctx->codec);
int ret, ok;
av_assert0(!frame->buf[0]);
if (codec->cb_type == FF_CODEC_CB_TYPE_RECEIVE_FRAME) {
ret = codec->cb.receive_frame(avctx, frame);
} else
ret = decode_simple_receive_frame(avctx, frame);
if (ret == AVERROR_EOF)
avci->draining_done = 1;
/* preserve ret */
ok = detect_colorspace(avctx, frame);
if (ok < 0) {
av_frame_unref(frame);
return ok;
}
if (!ret) {
frame->best_effort_timestamp = guess_correct_pts(avctx,
frame->pts,
frame->pkt_dts);
#if FF_API_PKT_DURATION
FF_DISABLE_DEPRECATION_WARNINGS
frame->pkt_duration = frame->duration;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
/* the only case where decode data is not set should be decoders
* that do not call ff_get_buffer() */
av_assert0((frame->private_ref && frame->private_ref->size == sizeof(FrameDecodeData)) ||
!(avctx->codec->capabilities & AV_CODEC_CAP_DR1));
if (frame->private_ref) {
FrameDecodeData *fdd = (FrameDecodeData*)frame->private_ref->data;
if (fdd->post_process) {
ret = fdd->post_process(avctx, frame);
if (ret < 0) {
av_frame_unref(frame);
return ret;
}
}
}
}
/* free the per-frame decode data */
av_buffer_unref(&frame->private_ref);
return ret;
}
int attribute_align_arg avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
{
AVCodecInternal *avci = avctx->internal;
int ret;
if (!avcodec_is_open(avctx) || !av_codec_is_decoder(avctx->codec))
return AVERROR(EINVAL);
if (avctx->internal->draining)
return AVERROR_EOF;
if (avpkt && !avpkt->size && avpkt->data)
return AVERROR(EINVAL);
av_packet_unref(avci->buffer_pkt);
if (avpkt && (avpkt->data || avpkt->side_data_elems)) {
ret = av_packet_ref(avci->buffer_pkt, avpkt);
if (ret < 0)
return ret;
}
ret = av_bsf_send_packet(avci->bsf, avci->buffer_pkt);
if (ret < 0) {
av_packet_unref(avci->buffer_pkt);
return ret;
}
if (!avci->buffer_frame->buf[0]) {
ret = decode_receive_frame_internal(avctx, avci->buffer_frame);
if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
return ret;
}
return 0;
}
static int apply_cropping(AVCodecContext *avctx, AVFrame *frame)
{
/* make sure we are noisy about decoders returning invalid cropping data */
if (frame->crop_left >= INT_MAX - frame->crop_right ||
frame->crop_top >= INT_MAX - frame->crop_bottom ||
(frame->crop_left + frame->crop_right) >= frame->width ||
(frame->crop_top + frame->crop_bottom) >= frame->height) {
av_log(avctx, AV_LOG_WARNING,
"Invalid cropping information set by a decoder: "
"%"SIZE_SPECIFIER"/%"SIZE_SPECIFIER"/%"SIZE_SPECIFIER"/%"SIZE_SPECIFIER" "
"(frame size %dx%d). This is a bug, please report it\n",
frame->crop_left, frame->crop_right, frame->crop_top, frame->crop_bottom,
frame->width, frame->height);
frame->crop_left = 0;
frame->crop_right = 0;
frame->crop_top = 0;
frame->crop_bottom = 0;
return 0;
}
if (!avctx->apply_cropping)
return 0;
return av_frame_apply_cropping(frame, avctx->flags & AV_CODEC_FLAG_UNALIGNED ?
AV_FRAME_CROP_UNALIGNED : 0);
}
// make sure frames returned to the caller are valid
static int frame_validate(AVCodecContext *avctx, AVFrame *frame)
{
if (!frame->buf[0] || frame->format < 0)
goto fail;
switch (avctx->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (frame->width <= 0 || frame->height <= 0)
goto fail;
break;
case AVMEDIA_TYPE_AUDIO:
if (!av_channel_layout_check(&frame->ch_layout) ||
frame->sample_rate <= 0)
goto fail;
break;
default: av_assert0(0);
}
return 0;
fail:
av_log(avctx, AV_LOG_ERROR, "An invalid frame was output by a decoder. "
"This is a bug, please report it.\n");
return AVERROR_BUG;
}
int ff_decode_receive_frame(AVCodecContext *avctx, AVFrame *frame)
{
AVCodecInternal *avci = avctx->internal;
int ret, changed;
if (!avcodec_is_open(avctx) || !av_codec_is_decoder(avctx->codec))
return AVERROR(EINVAL);
if (avci->buffer_frame->buf[0]) {
av_frame_move_ref(frame, avci->buffer_frame);
} else {
ret = decode_receive_frame_internal(avctx, frame);
if (ret < 0)
return ret;
}
ret = frame_validate(avctx, frame);
if (ret < 0)
goto fail;
if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
ret = apply_cropping(avctx, frame);
if (ret < 0)
goto fail;
}
avctx->frame_number++;
if (avctx->flags & AV_CODEC_FLAG_DROPCHANGED) {
if (avctx->frame_number == 1) {
avci->initial_format = frame->format;
switch(avctx->codec_type) {
case AVMEDIA_TYPE_VIDEO:
avci->initial_width = frame->width;
avci->initial_height = frame->height;
break;
case AVMEDIA_TYPE_AUDIO:
avci->initial_sample_rate = frame->sample_rate ? frame->sample_rate :
avctx->sample_rate;
ret = av_channel_layout_copy(&avci->initial_ch_layout, &frame->ch_layout);
if (ret < 0)
goto fail;
break;
}
}
if (avctx->frame_number > 1) {
changed = avci->initial_format != frame->format;
switch(avctx->codec_type) {
case AVMEDIA_TYPE_VIDEO:
changed |= avci->initial_width != frame->width ||
avci->initial_height != frame->height;
break;
case AVMEDIA_TYPE_AUDIO:
changed |= avci->initial_sample_rate != frame->sample_rate ||
avci->initial_sample_rate != avctx->sample_rate ||
av_channel_layout_compare(&avci->initial_ch_layout, &frame->ch_layout);
break;
}
if (changed) {
avci->changed_frames_dropped++;
av_log(avctx, AV_LOG_INFO, "dropped changed frame #%d pts %"PRId64
" drop count: %d \n",
avctx->frame_number, frame->pts,
avci->changed_frames_dropped);
ret = AVERROR_INPUT_CHANGED;
goto fail;
}
}
}
return 0;
fail:
av_frame_unref(frame);
return ret;
}
static void get_subtitle_defaults(AVSubtitle *sub)
{
memset(sub, 0, sizeof(*sub));
sub->pts = AV_NOPTS_VALUE;
}
#define UTF8_MAX_BYTES 4 /* 5 and 6 bytes sequences should not be used */
static int recode_subtitle(AVCodecContext *avctx, AVPacket **outpkt,
AVPacket *inpkt, AVPacket *buf_pkt)
{
#if CONFIG_ICONV
iconv_t cd = (iconv_t)-1;
int ret = 0;
char *inb, *outb;
size_t inl, outl;
#endif
if (avctx->sub_charenc_mode != FF_SUB_CHARENC_MODE_PRE_DECODER || inpkt->size == 0) {
*outpkt = inpkt;
return 0;
}
#if CONFIG_ICONV
inb = inpkt->data;
inl = inpkt->size;
if (inl >= INT_MAX / UTF8_MAX_BYTES - AV_INPUT_BUFFER_PADDING_SIZE) {
av_log(avctx, AV_LOG_ERROR, "Subtitles packet is too big for recoding\n");
return AVERROR(ERANGE);
}
cd = iconv_open("UTF-8", avctx->sub_charenc);
av_assert0(cd != (iconv_t)-1);
ret = av_new_packet(buf_pkt, inl * UTF8_MAX_BYTES);
if (ret < 0)
goto end;
ret = av_packet_copy_props(buf_pkt, inpkt);
if (ret < 0)
goto end;
outb = buf_pkt->data;
outl = buf_pkt->size;
if (iconv(cd, &inb, &inl, &outb, &outl) == (size_t)-1 ||
iconv(cd, NULL, NULL, &outb, &outl) == (size_t)-1 ||
outl >= buf_pkt->size || inl != 0) {
ret = FFMIN(AVERROR(errno), -1);
av_log(avctx, AV_LOG_ERROR, "Unable to recode subtitle event \"%s\" "
"from %s to UTF-8\n", inpkt->data, avctx->sub_charenc);
goto end;
}
buf_pkt->size -= outl;
memset(buf_pkt->data + buf_pkt->size, 0, outl);
*outpkt = buf_pkt;
ret = 0;
end:
if (ret < 0)
av_packet_unref(buf_pkt);
if (cd != (iconv_t)-1)
iconv_close(cd);
return ret;
#else
av_log(avctx, AV_LOG_ERROR, "requesting subtitles recoding without iconv");
return AVERROR(EINVAL);
#endif
}
static int utf8_check(const uint8_t *str)
{
const uint8_t *byte;
uint32_t codepoint, min;
while (*str) {
byte = str;
GET_UTF8(codepoint, *(byte++), return 0;);
min = byte - str == 1 ? 0 : byte - str == 2 ? 0x80 :
1 << (5 * (byte - str) - 4);
if (codepoint < min || codepoint >= 0x110000 ||
codepoint == 0xFFFE /* BOM */ ||
codepoint >= 0xD800 && codepoint <= 0xDFFF /* surrogates */)
return 0;
str = byte;
}
return 1;
}
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
int *got_sub_ptr,
AVPacket *avpkt)
{
int ret = 0;
if (!avpkt->data && avpkt->size) {
av_log(avctx, AV_LOG_ERROR, "invalid packet: NULL data, size != 0\n");
return AVERROR(EINVAL);
}
if (!avctx->codec)
return AVERROR(EINVAL);
if (avctx->codec->type != AVMEDIA_TYPE_SUBTITLE) {
av_log(avctx, AV_LOG_ERROR, "Invalid media type for subtitles\n");
return AVERROR(EINVAL);
}
*got_sub_ptr = 0;
get_subtitle_defaults(sub);
if ((avctx->codec->capabilities & AV_CODEC_CAP_DELAY) || avpkt->size) {
AVCodecInternal *avci = avctx->internal;
AVPacket *pkt;
ret = recode_subtitle(avctx, &pkt, avpkt, avci->buffer_pkt);
if (ret < 0)
return ret;
if (avctx->pkt_timebase.num && avpkt->pts != AV_NOPTS_VALUE)
sub->pts = av_rescale_q(avpkt->pts,
avctx->pkt_timebase, AV_TIME_BASE_Q);
ret = ffcodec(avctx->codec)->cb.decode_sub(avctx, sub, got_sub_ptr, pkt);
if (pkt == avci->buffer_pkt) // did we recode?
av_packet_unref(avci->buffer_pkt);
if (ret < 0) {
*got_sub_ptr = 0;
avsubtitle_free(sub);
return ret;
}
av_assert1(!sub->num_rects || *got_sub_ptr);
if (sub->num_rects && !sub->end_display_time && avpkt->duration &&
avctx->pkt_timebase.num) {
AVRational ms = { 1, 1000 };
sub->end_display_time = av_rescale_q(avpkt->duration,
avctx->pkt_timebase, ms);
}
if (avctx->codec_descriptor->props & AV_CODEC_PROP_BITMAP_SUB)
sub->format = 0;
else if (avctx->codec_descriptor->props & AV_CODEC_PROP_TEXT_SUB)
sub->format = 1;
for (unsigned i = 0; i < sub->num_rects; i++) {
if (avctx->sub_charenc_mode != FF_SUB_CHARENC_MODE_IGNORE &&
sub->rects[i]->ass && !utf8_check(sub->rects[i]->ass)) {
av_log(avctx, AV_LOG_ERROR,
"Invalid UTF-8 in decoded subtitles text; "
"maybe missing -sub_charenc option\n");
avsubtitle_free(sub);
*got_sub_ptr = 0;
return AVERROR_INVALIDDATA;
}
}
if (*got_sub_ptr)
avctx->frame_number++;
}
return ret;
}
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *avctx,
const enum AVPixelFormat *fmt)
{
const AVPixFmtDescriptor *desc;
const AVCodecHWConfig *config;
int i, n;
// If a device was supplied when the codec was opened, assume that the
// user wants to use it.
if (avctx->hw_device_ctx && ffcodec(avctx->codec)->hw_configs) {
AVHWDeviceContext *device_ctx =
(AVHWDeviceContext*)avctx->hw_device_ctx->data;
for (i = 0;; i++) {
config = &ffcodec(avctx->codec)->hw_configs[i]->public;
if (!config)
break;
if (!(config->methods &
AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX))
continue;
if (device_ctx->type != config->device_type)
continue;
for (n = 0; fmt[n] != AV_PIX_FMT_NONE; n++) {
if (config->pix_fmt == fmt[n])
return fmt[n];
}
}
}
// No device or other setup, so we have to choose from things which
// don't any other external information.
// If the last element of the list is a software format, choose it
// (this should be best software format if any exist).
for (n = 0; fmt[n] != AV_PIX_FMT_NONE; n++);
desc = av_pix_fmt_desc_get(fmt[n - 1]);
if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
return fmt[n - 1];
// Finally, traverse the list in order and choose the first entry
// with no external dependencies (if there is no hardware configuration
// information available then this just picks the first entry).
for (n = 0; fmt[n] != AV_PIX_FMT_NONE; n++) {
for (i = 0;; i++) {
config = avcodec_get_hw_config(avctx->codec, i);
if (!config)
break;
if (config->pix_fmt == fmt[n])
break;
}
if (!config) {
// No specific config available, so the decoder must be able
// to handle this format without any additional setup.
return fmt[n];
}
if (config->methods & AV_CODEC_HW_CONFIG_METHOD_INTERNAL) {
// Usable with only internal setup.
return fmt[n];
}
}
// Nothing is usable, give up.
return AV_PIX_FMT_NONE;
}
int ff_decode_get_hw_frames_ctx(AVCodecContext *avctx,
enum AVHWDeviceType dev_type)
{
AVHWDeviceContext *device_ctx;
AVHWFramesContext *frames_ctx;
int ret;
if (!avctx->hwaccel)
return AVERROR(ENOSYS);
if (avctx->hw_frames_ctx)
return 0;
if (!avctx->hw_device_ctx) {
av_log(avctx, AV_LOG_ERROR, "A hardware frames or device context is "
"required for hardware accelerated decoding.\n");
return AVERROR(EINVAL);
}
device_ctx = (AVHWDeviceContext *)avctx->hw_device_ctx->data;
if (device_ctx->type != dev_type) {
av_log(avctx, AV_LOG_ERROR, "Device type %s expected for hardware "
"decoding, but got %s.\n", av_hwdevice_get_type_name(dev_type),
av_hwdevice_get_type_name(device_ctx->type));
return AVERROR(EINVAL);
}
ret = avcodec_get_hw_frames_parameters(avctx,
avctx->hw_device_ctx,
avctx->hwaccel->pix_fmt,
&avctx->hw_frames_ctx);
if (ret < 0)
return ret;
frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
if (frames_ctx->initial_pool_size) {
// We guarantee 4 base work surfaces. The function above guarantees 1
// (the absolute minimum), so add the missing count.
frames_ctx->initial_pool_size += 3;
}
ret = av_hwframe_ctx_init(avctx->hw_frames_ctx);
if (ret < 0) {
av_buffer_unref(&avctx->hw_frames_ctx);
return ret;
}
return 0;
}
int avcodec_get_hw_frames_parameters(AVCodecContext *avctx,
AVBufferRef *device_ref,
enum AVPixelFormat hw_pix_fmt,
AVBufferRef **out_frames_ref)
{
AVBufferRef *frames_ref = NULL;
const AVCodecHWConfigInternal *hw_config;
const AVHWAccel *hwa;
int i, ret;
for (i = 0;; i++) {
hw_config = ffcodec(avctx->codec)->hw_configs[i];
if (!hw_config)
return AVERROR(ENOENT);
if (hw_config->public.pix_fmt == hw_pix_fmt)
break;
}
hwa = hw_config->hwaccel;
if (!hwa || !hwa->frame_params)
return AVERROR(ENOENT);
frames_ref = av_hwframe_ctx_alloc(device_ref);
if (!frames_ref)
return AVERROR(ENOMEM);
ret = hwa->frame_params(avctx, frames_ref);
if (ret >= 0) {
AVHWFramesContext *frames_ctx = (AVHWFramesContext*)frames_ref->data;
if (frames_ctx->initial_pool_size) {
// If the user has requested that extra output surfaces be
// available then add them here.
if (avctx->extra_hw_frames > 0)
frames_ctx->initial_pool_size += avctx->extra_hw_frames;
// If frame threading is enabled then an extra surface per thread
// is also required.
if (avctx->active_thread_type & FF_THREAD_FRAME)
frames_ctx->initial_pool_size += avctx->thread_count;
}
*out_frames_ref = frames_ref;
} else {
av_buffer_unref(&frames_ref);
}
return ret;
}
static int hwaccel_init(AVCodecContext *avctx,
const AVCodecHWConfigInternal *hw_config)
{
const AVHWAccel *hwaccel;
int err;
hwaccel = hw_config->hwaccel;
if (hwaccel->capabilities & AV_HWACCEL_CODEC_CAP_EXPERIMENTAL &&
avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
av_log(avctx, AV_LOG_WARNING, "Ignoring experimental hwaccel: %s\n",
hwaccel->name);
return AVERROR_PATCHWELCOME;
}
if (hwaccel->priv_data_size) {
avctx->internal->hwaccel_priv_data =
av_mallocz(hwaccel->priv_data_size);
if (!avctx->internal->hwaccel_priv_data)
return AVERROR(ENOMEM);
}
avctx->hwaccel = hwaccel;
if (hwaccel->init) {
err = hwaccel->init(avctx);
if (err < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed setup for format %s: "
"hwaccel initialisation returned error.\n",
av_get_pix_fmt_name(hw_config->public.pix_fmt));
av_freep(&avctx->internal->hwaccel_priv_data);
avctx->hwaccel = NULL;
return err;
}
}
return 0;
}
static void hwaccel_uninit(AVCodecContext *avctx)
{
if (avctx->hwaccel && avctx->hwaccel->uninit)
avctx->hwaccel->uninit(avctx);
av_freep(&avctx->internal->hwaccel_priv_data);
avctx->hwaccel = NULL;
av_buffer_unref(&avctx->hw_frames_ctx);
}
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
{
const AVPixFmtDescriptor *desc;
enum AVPixelFormat *choices;
enum AVPixelFormat ret, user_choice;
const AVCodecHWConfigInternal *hw_config;
const AVCodecHWConfig *config;
int i, n, err;
// Find end of list.
for (n = 0; fmt[n] != AV_PIX_FMT_NONE; n++);
// Must contain at least one entry.
av_assert0(n >= 1);
// If a software format is available, it must be the last entry.
desc = av_pix_fmt_desc_get(fmt[n - 1]);
if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL) {
// No software format is available.
} else {
avctx->sw_pix_fmt = fmt[n - 1];
}
choices = av_memdup(fmt, (n + 1) * sizeof(*choices));
if (!choices)
return AV_PIX_FMT_NONE;
for (;;) {
// Remove the previous hwaccel, if there was one.
hwaccel_uninit(avctx);
user_choice = avctx->get_format(avctx, choices);
if (user_choice == AV_PIX_FMT_NONE) {
// Explicitly chose nothing, give up.
ret = AV_PIX_FMT_NONE;
break;
}
desc = av_pix_fmt_desc_get(user_choice);
if (!desc) {
av_log(avctx, AV_LOG_ERROR, "Invalid format returned by "
"get_format() callback.\n");
ret = AV_PIX_FMT_NONE;
break;
}
av_log(avctx, AV_LOG_DEBUG, "Format %s chosen by get_format().\n",
desc->name);
for (i = 0; i < n; i++) {
if (choices[i] == user_choice)
break;
}
if (i == n) {
av_log(avctx, AV_LOG_ERROR, "Invalid return from get_format(): "
"%s not in possible list.\n", desc->name);
ret = AV_PIX_FMT_NONE;
break;
}
if (ffcodec(avctx->codec)->hw_configs) {
for (i = 0;; i++) {
hw_config = ffcodec(avctx->codec)->hw_configs[i];
if (!hw_config)
break;
if (hw_config->public.pix_fmt == user_choice)
break;
}
} else {
hw_config = NULL;
}
if (!hw_config) {
// No config available, so no extra setup required.
ret = user_choice;
break;
}
config = &hw_config->public;
if (config->methods &
AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX &&
avctx->hw_frames_ctx) {
const AVHWFramesContext *frames_ctx =
(AVHWFramesContext*)avctx->hw_frames_ctx->data;
if (frames_ctx->format != user_choice) {
av_log(avctx, AV_LOG_ERROR, "Invalid setup for format %s: "
"does not match the format of the provided frames "
"context.\n", desc->name);
goto try_again;
}
} else if (config->methods &
AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX &&
avctx->hw_device_ctx) {
const AVHWDeviceContext *device_ctx =
(AVHWDeviceContext*)avctx->hw_device_ctx->data;
if (device_ctx->type != config->device_type) {
av_log(avctx, AV_LOG_ERROR, "Invalid setup for format %s: "
"does not match the type of the provided device "
"context.\n", desc->name);
goto try_again;
}
} else if (config->methods &
AV_CODEC_HW_CONFIG_METHOD_INTERNAL) {
// Internal-only setup, no additional configuration.
} else if (config->methods &
AV_CODEC_HW_CONFIG_METHOD_AD_HOC) {
// Some ad-hoc configuration we can't see and can't check.
} else {
av_log(avctx, AV_LOG_ERROR, "Invalid setup for format %s: "
"missing configuration.\n", desc->name);
goto try_again;
}
if (hw_config->hwaccel) {
av_log(avctx, AV_LOG_DEBUG, "Format %s requires hwaccel "
"initialisation.\n", desc->name);
err = hwaccel_init(avctx, hw_config);
if (err < 0)
goto try_again;
}
ret = user_choice;
break;
try_again:
av_log(avctx, AV_LOG_DEBUG, "Format %s not usable, retrying "
"get_format() without it.\n", desc->name);
for (i = 0; i < n; i++) {
if (choices[i] == user_choice)
break;
}
for (; i + 1 < n; i++)
choices[i] = choices[i + 1];
--n;
}
av_freep(&choices);
return ret;
}
static int add_metadata_from_side_data(const AVPacket *avpkt, AVFrame *frame)
{
size_t size;
const uint8_t *side_metadata;
AVDictionary **frame_md = &frame->metadata;
side_metadata = av_packet_get_side_data(avpkt,
AV_PKT_DATA_STRINGS_METADATA, &size);
return av_packet_unpack_dictionary(side_metadata, size, frame_md);
}
int ff_decode_frame_props_from_pkt(AVFrame *frame, const AVPacket *pkt)
{
static const struct {
enum AVPacketSideDataType packet;
enum AVFrameSideDataType frame;
} sd[] = {
{ AV_PKT_DATA_REPLAYGAIN , AV_FRAME_DATA_REPLAYGAIN },
{ AV_PKT_DATA_DISPLAYMATRIX, AV_FRAME_DATA_DISPLAYMATRIX },
{ AV_PKT_DATA_SPHERICAL, AV_FRAME_DATA_SPHERICAL },
{ AV_PKT_DATA_STEREO3D, AV_FRAME_DATA_STEREO3D },
{ AV_PKT_DATA_AUDIO_SERVICE_TYPE, AV_FRAME_DATA_AUDIO_SERVICE_TYPE },
{ AV_PKT_DATA_MASTERING_DISPLAY_METADATA, AV_FRAME_DATA_MASTERING_DISPLAY_METADATA },
{ AV_PKT_DATA_CONTENT_LIGHT_LEVEL, AV_FRAME_DATA_CONTENT_LIGHT_LEVEL },
{ AV_PKT_DATA_A53_CC, AV_FRAME_DATA_A53_CC },
{ AV_PKT_DATA_ICC_PROFILE, AV_FRAME_DATA_ICC_PROFILE },
{ AV_PKT_DATA_S12M_TIMECODE, AV_FRAME_DATA_S12M_TIMECODE },
{ AV_PKT_DATA_DYNAMIC_HDR10_PLUS, AV_FRAME_DATA_DYNAMIC_HDR_PLUS },
};
frame->pts = pkt->pts;
frame->pkt_pos = pkt->pos;
frame->duration = pkt->duration;
frame->pkt_size = pkt->size;
for (int i = 0; i < FF_ARRAY_ELEMS(sd); i++) {
size_t size;
uint8_t *packet_sd = av_packet_get_side_data(pkt, sd[i].packet, &size);
if (packet_sd) {
AVFrameSideData *frame_sd = av_frame_new_side_data(frame,
sd[i].frame,
size);
if (!frame_sd)
return AVERROR(ENOMEM);
memcpy(frame_sd->data, packet_sd, size);
}
}
add_metadata_from_side_data(pkt, frame);
if (pkt->flags & AV_PKT_FLAG_DISCARD) {
frame->flags |= AV_FRAME_FLAG_DISCARD;
} else {
frame->flags = (frame->flags & ~AV_FRAME_FLAG_DISCARD);
}
return 0;
}
int ff_decode_frame_props(AVCodecContext *avctx, AVFrame *frame)
{
const AVPacket *pkt = avctx->internal->last_pkt_props;
if (!(ffcodec(avctx->codec)->caps_internal & FF_CODEC_CAP_SETS_FRAME_PROPS)) {
int ret = ff_decode_frame_props_from_pkt(frame, pkt);
if (ret < 0)
return ret;
frame->pkt_size = (int)(intptr_t)pkt->opaque;
}
frame->reordered_opaque = avctx->reordered_opaque;
if (frame->color_primaries == AVCOL_PRI_UNSPECIFIED)
frame->color_primaries = avctx->color_primaries;
if (frame->color_trc == AVCOL_TRC_UNSPECIFIED)
frame->color_trc = avctx->color_trc;
if (frame->colorspace == AVCOL_SPC_UNSPECIFIED)
frame->colorspace = avctx->colorspace;
if (frame->color_range == AVCOL_RANGE_UNSPECIFIED)
frame->color_range = avctx->color_range;
if (frame->chroma_location == AVCHROMA_LOC_UNSPECIFIED)
frame->chroma_location = avctx->chroma_sample_location;
switch (avctx->codec->type) {
case AVMEDIA_TYPE_VIDEO:
frame->format = avctx->pix_fmt;
if (!frame->sample_aspect_ratio.num)
frame->sample_aspect_ratio = avctx->sample_aspect_ratio;
if (frame->width && frame->height &&
av_image_check_sar(frame->width, frame->height,
frame->sample_aspect_ratio) < 0) {
av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
frame->sample_aspect_ratio.num,
frame->sample_aspect_ratio.den);
frame->sample_aspect_ratio = (AVRational){ 0, 1 };
}
break;
case AVMEDIA_TYPE_AUDIO:
if (!frame->sample_rate)
frame->sample_rate = avctx->sample_rate;
if (frame->format < 0)
frame->format = avctx->sample_fmt;
if (!frame->ch_layout.nb_channels) {
int ret = av_channel_layout_copy(&frame->ch_layout, &avctx->ch_layout);
if (ret < 0)
return ret;
}
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
frame->channels = frame->ch_layout.nb_channels;
frame->channel_layout = frame->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
frame->ch_layout.u.mask : 0;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
break;
}
return 0;
}
static void validate_avframe_allocation(AVCodecContext *avctx, AVFrame *frame)
{
if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
int i;
int num_planes = av_pix_fmt_count_planes(frame->format);
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
int flags = desc ? desc->flags : 0;
if (num_planes == 1 && (flags & AV_PIX_FMT_FLAG_PAL))
num_planes = 2;
for (i = 0; i < num_planes; i++) {
av_assert0(frame->data[i]);
}
// For formats without data like hwaccel allow unused pointers to be non-NULL.
for (i = num_planes; num_planes > 0 && i < FF_ARRAY_ELEMS(frame->data); i++) {
if (frame->data[i])
av_log(avctx, AV_LOG_ERROR, "Buffer returned by get_buffer2() did not zero unused plane pointers\n");
frame->data[i] = NULL;
}
}
}
static void decode_data_free(void *opaque, uint8_t *data)
{
FrameDecodeData *fdd = (FrameDecodeData*)data;
if (fdd->post_process_opaque_free)
fdd->post_process_opaque_free(fdd->post_process_opaque);
if (fdd->hwaccel_priv_free)
fdd->hwaccel_priv_free(fdd->hwaccel_priv);
av_freep(&fdd);
}
int ff_attach_decode_data(AVFrame *frame)
{
AVBufferRef *fdd_buf;
FrameDecodeData *fdd;
av_assert1(!frame->private_ref);
av_buffer_unref(&frame->private_ref);
fdd = av_mallocz(sizeof(*fdd));
if (!fdd)
return AVERROR(ENOMEM);
fdd_buf = av_buffer_create((uint8_t*)fdd, sizeof(*fdd), decode_data_free,
NULL, AV_BUFFER_FLAG_READONLY);
if (!fdd_buf) {
av_freep(&fdd);
return AVERROR(ENOMEM);
}
frame->private_ref = fdd_buf;
return 0;
}
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
{
const AVHWAccel *hwaccel = avctx->hwaccel;
int override_dimensions = 1;
int ret;
av_assert0(av_codec_is_decoder(avctx->codec));
if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
if ((unsigned)avctx->width > INT_MAX - STRIDE_ALIGN ||
(ret = av_image_check_size2(FFALIGN(avctx->width, STRIDE_ALIGN), avctx->height, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx)) < 0 || avctx->pix_fmt<0) {
av_log(avctx, AV_LOG_ERROR, "video_get_buffer: image parameters invalid\n");
ret = AVERROR(EINVAL);
goto fail;
}
if (frame->width <= 0 || frame->height <= 0) {
frame->width = FFMAX(avctx->width, AV_CEIL_RSHIFT(avctx->coded_width, avctx->lowres));
frame->height = FFMAX(avctx->height, AV_CEIL_RSHIFT(avctx->coded_height, avctx->lowres));
override_dimensions = 0;
}
if (frame->data[0] || frame->data[1] || frame->data[2] || frame->data[3]) {
av_log(avctx, AV_LOG_ERROR, "pic->data[*]!=NULL in get_buffer_internal\n");
ret = AVERROR(EINVAL);
goto fail;
}
} else if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
/* compat layer for old-style get_buffer() implementations */
avctx->channels = avctx->ch_layout.nb_channels;
avctx->channel_layout = (avctx->ch_layout.order == AV_CHANNEL_ORDER_NATIVE) ?
avctx->ch_layout.u.mask : 0;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (frame->nb_samples * (int64_t)avctx->ch_layout.nb_channels > avctx->max_samples) {
av_log(avctx, AV_LOG_ERROR, "samples per frame %d, exceeds max_samples %"PRId64"\n", frame->nb_samples, avctx->max_samples);
ret = AVERROR(EINVAL);
goto fail;
}
}
ret = ff_decode_frame_props(avctx, frame);
if (ret < 0)
goto fail;
if (hwaccel) {
if (hwaccel->alloc_frame) {
ret = hwaccel->alloc_frame(avctx, frame);
goto end;
}
} else
avctx->sw_pix_fmt = avctx->pix_fmt;
ret = avctx->get_buffer2(avctx, frame, flags);
if (ret < 0)
goto fail;
validate_avframe_allocation(avctx, frame);
ret = ff_attach_decode_data(frame);
if (ret < 0)
goto fail;
end:
if (avctx->codec_type == AVMEDIA_TYPE_VIDEO && !override_dimensions &&
!(ffcodec(avctx->codec)->caps_internal & FF_CODEC_CAP_EXPORTS_CROPPING)) {
frame->width = avctx->width;
frame->height = avctx->height;
}
fail:
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
av_frame_unref(frame);
}
return ret;
}
static int reget_buffer_internal(AVCodecContext *avctx, AVFrame *frame, int flags)
{
AVFrame *tmp;
int ret;
av_assert0(avctx->codec_type == AVMEDIA_TYPE_VIDEO);
if (frame->data[0] && (frame->width != avctx->width || frame->height != avctx->height || frame->format != avctx->pix_fmt)) {
av_log(avctx, AV_LOG_WARNING, "Picture changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s in reget buffer()\n",
frame->width, frame->height, av_get_pix_fmt_name(frame->format), avctx->width, avctx->height, av_get_pix_fmt_name(avctx->pix_fmt));
av_frame_unref(frame);
}
if (!frame->data[0])
return ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF);
if ((flags & FF_REGET_BUFFER_FLAG_READONLY) || av_frame_is_writable(frame))
return ff_decode_frame_props(avctx, frame);
tmp = av_frame_alloc();
if (!tmp)
return AVERROR(ENOMEM);
av_frame_move_ref(tmp, frame);
ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF);
if (ret < 0) {
av_frame_free(&tmp);
return ret;
}
av_frame_copy(frame, tmp);
av_frame_free(&tmp);
return 0;
}
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
{
int ret = reget_buffer_internal(avctx, frame, flags);
if (ret < 0)
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return ret;
}
int ff_decode_preinit(AVCodecContext *avctx)
{
AVCodecInternal *avci = avctx->internal;
int ret = 0;
/* if the decoder init function was already called previously,
* free the already allocated subtitle_header before overwriting it */
av_freep(&avctx->subtitle_header);
#if FF_API_THREAD_SAFE_CALLBACKS
FF_DISABLE_DEPRECATION_WARNINGS
if ((avctx->thread_type & FF_THREAD_FRAME) &&
avctx->get_buffer2 != avcodec_default_get_buffer2 &&
!avctx->thread_safe_callbacks) {
av_log(avctx, AV_LOG_WARNING, "Requested frame threading with a "
"custom get_buffer2() implementation which is not marked as "
"thread safe. This is not supported anymore, make your "
"callback thread-safe.\n");
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (avctx->codec->max_lowres < avctx->lowres || avctx->lowres < 0) {
av_log(avctx, AV_LOG_WARNING, "The maximum value for lowres supported by the decoder is %d\n",
avctx->codec->max_lowres);
avctx->lowres = avctx->codec->max_lowres;
}
if (avctx->sub_charenc) {
if (avctx->codec_type != AVMEDIA_TYPE_SUBTITLE) {
av_log(avctx, AV_LOG_ERROR, "Character encoding is only "
"supported with subtitles codecs\n");
return AVERROR(EINVAL);
} else if (avctx->codec_descriptor->props & AV_CODEC_PROP_BITMAP_SUB) {
av_log(avctx, AV_LOG_WARNING, "Codec '%s' is bitmap-based, "
"subtitles character encoding will be ignored\n",
avctx->codec_descriptor->name);
avctx->sub_charenc_mode = FF_SUB_CHARENC_MODE_DO_NOTHING;
} else {
/* input character encoding is set for a text based subtitle
* codec at this point */
if (avctx->sub_charenc_mode == FF_SUB_CHARENC_MODE_AUTOMATIC)
avctx->sub_charenc_mode = FF_SUB_CHARENC_MODE_PRE_DECODER;
if (avctx->sub_charenc_mode == FF_SUB_CHARENC_MODE_PRE_DECODER) {
#if CONFIG_ICONV
iconv_t cd = iconv_open("UTF-8", avctx->sub_charenc);
if (cd == (iconv_t)-1) {
ret = AVERROR(errno);
av_log(avctx, AV_LOG_ERROR, "Unable to open iconv context "
"with input character encoding \"%s\"\n", avctx->sub_charenc);
return ret;
}
iconv_close(cd);
#else
av_log(avctx, AV_LOG_ERROR, "Character encoding subtitles "
"conversion needs a libavcodec built with iconv support "
"for this codec\n");
return AVERROR(ENOSYS);
#endif
}
}
}
avctx->pts_correction_num_faulty_pts =
avctx->pts_correction_num_faulty_dts = 0;
avctx->pts_correction_last_pts =
avctx->pts_correction_last_dts = INT64_MIN;
if ( !CONFIG_GRAY && avctx->flags & AV_CODEC_FLAG_GRAY
&& avctx->codec_descriptor->type == AVMEDIA_TYPE_VIDEO)
av_log(avctx, AV_LOG_WARNING,
"gray decoding requested but not enabled at configuration time\n");
if (avctx->flags2 & AV_CODEC_FLAG2_EXPORT_MVS) {
avctx->export_side_data |= AV_CODEC_EXPORT_DATA_MVS;
}
avci->in_pkt = av_packet_alloc();
avci->last_pkt_props = av_packet_alloc();
if (!avci->in_pkt || !avci->last_pkt_props)
return AVERROR(ENOMEM);
ret = decode_bsfs_init(avctx);
if (ret < 0)
return ret;
return 0;
}
int ff_copy_palette(void *dst, const AVPacket *src, void *logctx)
{
size_t size;
const void *pal = av_packet_get_side_data(src, AV_PKT_DATA_PALETTE, &size);
if (pal && size == AVPALETTE_SIZE) {
memcpy(dst, pal, AVPALETTE_SIZE);
return 1;
} else if (pal) {
av_log(logctx, AV_LOG_ERROR,
"Palette size %"SIZE_SPECIFIER" is wrong\n", size);
}
return 0;
}
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