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h264: support frame parameter changes during frame-mt

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Fixes CVE-2012-2782.
This commit is contained in:
Janne Grunau 2012-09-06 13:30:08 +02:00
parent f1d8763a02
commit 9e696d2e5f
2 changed files with 233 additions and 130 deletions
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361
libavcodec/h264.c
View File

@ -1135,6 +1135,10 @@ static int decode_init_thread_copy(AVCodecContext *avctx)
memcpy(&to->start_field, &from->start_field, \
(char *)&to->end_field - (char *)&to->start_field)
static int h264_slice_header_init(H264Context *, int);
static int h264_set_parameter_from_sps(H264Context *h);
static int decode_update_thread_context(AVCodecContext *dst,
const AVCodecContext *src)
{
@ -1146,11 +1150,42 @@ static int decode_update_thread_context(AVCodecContext *dst,
if (dst == src || !s1->context_initialized)
return 0;
if (inited &&
(s->width != s1->width ||
s->height != s1->height ||
s->mb_width != s1->mb_width ||
s->mb_height != s1->mb_height ||
h->sps.bit_depth_luma != h1->sps.bit_depth_luma ||
h->sps.chroma_format_idc != h1->sps.chroma_format_idc ||
h->sps.colorspace != h1->sps.colorspace)) {
av_freep(&h->bipred_scratchpad);
s->width = s1->width;
s->height = s1->height;
s->mb_height = s1->mb_height;
h->b_stride = h1->b_stride;
if ((err = h264_slice_header_init(h, 1)) < 0) {
av_log(h->s.avctx, AV_LOG_ERROR, "h264_slice_header_init() failed");
return err;
}
h->context_reinitialized = 1;
/* update linesize on resize for h264. The h264 decoder doesn't
* necessarily call ff_MPV_frame_start in the new thread */
s->linesize = s1->linesize;
s->uvlinesize = s1->uvlinesize;
/* copy block_offset since frame_start may not be called */
memcpy(h->block_offset, h1->block_offset, sizeof(h->block_offset));
h264_set_parameter_from_sps(h);
}
err = ff_mpeg_update_thread_context(dst, src);
if (err)
return err;
// FIXME handle width/height changing
if (!inited) {
for (i = 0; i < MAX_SPS_COUNT; i++)
av_freep(h->sps_buffers + i);
@ -2095,15 +2130,9 @@ static void idr(H264Context *h)
}
/* forget old pics after a seek */
static void flush_dpb(AVCodecContext *avctx)
static void flush_change(H264Context *h)
{
H264Context *h = avctx->priv_data;
int i;
for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++) {
if (h->delayed_pic[i])
h->delayed_pic[i]->f.reference = 0;
h->delayed_pic[i] = NULL;
}
for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++)
h->last_pocs[i] = INT_MIN;
h->outputed_poc = h->next_outputed_poc = INT_MIN;
@ -2112,7 +2141,26 @@ static void flush_dpb(AVCodecContext *avctx)
if (h->s.current_picture_ptr)
h->s.current_picture_ptr->f.reference = 0;
h->s.first_field = 0;
memset(h->ref_list[0], 0, sizeof(h->ref_list[0]));
memset(h->ref_list[1], 0, sizeof(h->ref_list[1]));
memset(h->default_ref_list[0], 0, sizeof(h->default_ref_list[0]));
memset(h->default_ref_list[1], 0, sizeof(h->default_ref_list[1]));
ff_h264_reset_sei(h);
}
/* forget old pics after a seek */
static void flush_dpb(AVCodecContext *avctx)
{
H264Context *h = avctx->priv_data;
int i;
for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++) {
if (h->delayed_pic[i])
h->delayed_pic[i]->f.reference = 0;
h->delayed_pic[i] = NULL;
}
flush_change(h);
ff_mpeg_flush(avctx);
}
@ -2400,6 +2448,127 @@ static int h264_set_parameter_from_sps(H264Context *h)
return 0;
}
static enum PixelFormat get_pixel_format(H264Context *h)
{
MpegEncContext *const s = &h->s;
switch (h->sps.bit_depth_luma) {
case 9:
if (CHROMA444) {
if (s->avctx->colorspace == AVCOL_SPC_RGB) {
return AV_PIX_FMT_GBRP9;
} else
return AV_PIX_FMT_YUV444P9;
} else if (CHROMA422)
return AV_PIX_FMT_YUV422P9;
else
return AV_PIX_FMT_YUV420P9;
break;
case 10:
if (CHROMA444) {
if (s->avctx->colorspace == AVCOL_SPC_RGB) {
return AV_PIX_FMT_GBRP10;
} else
return AV_PIX_FMT_YUV444P10;
} else if (CHROMA422)
return AV_PIX_FMT_YUV422P10;
else
return AV_PIX_FMT_YUV420P10;
break;
case 8:
if (CHROMA444) {
if (s->avctx->colorspace == AVCOL_SPC_RGB) {
return AV_PIX_FMT_GBRP;
} else
return s->avctx->color_range == AVCOL_RANGE_JPEG ? AV_PIX_FMT_YUVJ444P
: AV_PIX_FMT_YUV444P;
} else if (CHROMA422) {
return s->avctx->color_range == AVCOL_RANGE_JPEG ? AV_PIX_FMT_YUVJ422P
: AV_PIX_FMT_YUV422P;
} else {
return s->avctx->get_format(s->avctx, s->avctx->codec->pix_fmts ?
s->avctx->codec->pix_fmts :
s->avctx->color_range == AVCOL_RANGE_JPEG ?
hwaccel_pixfmt_list_h264_jpeg_420 :
ff_hwaccel_pixfmt_list_420);
}
break;
default:
av_log(s->avctx, AV_LOG_ERROR,
"Unsupported bit depth: %d\n", h->sps.bit_depth_luma);
return AVERROR_INVALIDDATA;
}
}
static int h264_slice_header_init(H264Context *h, int reinit)
{
MpegEncContext *const s = &h->s;
int i, ret;
avcodec_set_dimensions(s->avctx, s->width, s->height);
s->avctx->sample_aspect_ratio = h->sps.sar;
av_assert0(s->avctx->sample_aspect_ratio.den);
if (h->sps.timing_info_present_flag) {
int64_t den = h->sps.time_scale;
if (h->x264_build < 44U)
den *= 2;
av_reduce(&s->avctx->time_base.num, &s->avctx->time_base.den,
h->sps.num_units_in_tick, den, 1 << 30);
}
s->avctx->hwaccel = ff_find_hwaccel(s->avctx->codec->id, s->avctx->pix_fmt);
if (reinit) {
free_tables(h, 0);
if ((ret = ff_MPV_common_frame_size_change(s)) < 0) {
av_log(h->s.avctx, AV_LOG_ERROR, "ff_MPV_common_frame_size_change() failed.\n");
return ret;
}
} else {
if ((ret = ff_MPV_common_init(s) < 0)) {
av_log(h->s.avctx, AV_LOG_ERROR, "ff_MPV_common_init() failed.\n");
return ret;
}
}
s->first_field = 0;
h->prev_interlaced_frame = 1;
init_scan_tables(h);
if (ff_h264_alloc_tables(h) < 0) {
av_log(h->s.avctx, AV_LOG_ERROR,
"Could not allocate memory for h264\n");
return AVERROR(ENOMEM);
}
if (!HAVE_THREADS || !(s->avctx->active_thread_type & FF_THREAD_SLICE)) {
if (context_init(h) < 0) {
av_log(h->s.avctx, AV_LOG_ERROR, "context_init() failed.\n");
return -1;
}
} else {
for (i = 1; i < s->slice_context_count; i++) {
H264Context *c;
c = h->thread_context[i] = av_malloc(sizeof(H264Context));
memcpy(c, h->s.thread_context[i], sizeof(MpegEncContext));
memset(&c->s + 1, 0, sizeof(H264Context) - sizeof(MpegEncContext));
c->h264dsp = h->h264dsp;
c->sps = h->sps;
c->pps = h->pps;
c->pixel_shift = h->pixel_shift;
init_scan_tables(c);
clone_tables(c, h, i);
}
for (i = 0; i < s->slice_context_count; i++)
if (context_init(h->thread_context[i]) < 0) {
av_log(h->s.avctx, AV_LOG_ERROR, "context_init() failed.\n");
return -1;
}
}
return 0;
}
/**
* Decode a slice header.
* This will also call ff_MPV_common_init() and frame_start() as needed.
@ -2420,6 +2589,8 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
unsigned int slice_type, tmp, i, j;
int default_ref_list_done = 0;
int last_pic_structure, last_pic_droppable;
int needs_reinit = 0;
enum AVPixelFormat pix_fmt;
/* FIXME: 2tap qpel isn't implemented for high bit depth. */
if ((s->avctx->flags2 & CODEC_FLAG2_FAST) &&
@ -2494,6 +2665,7 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
}
if (h->pps.sps_id != h->current_sps_id ||
h->context_reinitialized ||
h0->sps_buffers[h->pps.sps_id]->new) {
h0->sps_buffers[h->pps.sps_id]->new = 0;
@ -2508,6 +2680,10 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
s->avctx->level = h->sps.level_idc;
s->avctx->refs = h->sps.ref_frame_count;
if (s->mb_width != h->sps.mb_width ||
s->mb_height != h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag))
needs_reinit = 1;
s->mb_width = h->sps.mb_width;
s->mb_height = h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag);
@ -2527,17 +2703,50 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
s->height = s->avctx->height;
}
if (s->context_initialized &&
(s->width != s->avctx->width || s->height != s->avctx->height ||
av_cmp_q(h->sps.sar, s->avctx->sample_aspect_ratio))) {
if (h != h0 || (HAVE_THREADS && h->s.avctx->active_thread_type & FF_THREAD_FRAME)) {
av_log_missing_feature(s->avctx,
"Width/height changing with threads", 0);
return AVERROR_PATCHWELCOME; // width / height changed during parallelized decoding
if (h->sps.video_signal_type_present_flag) {
s->avctx->color_range = h->sps.full_range ? AVCOL_RANGE_JPEG
: AVCOL_RANGE_MPEG;
if (h->sps.colour_description_present_flag) {
s->avctx->color_primaries = h->sps.color_primaries;
s->avctx->color_trc = h->sps.color_trc;
s->avctx->colorspace = h->sps.colorspace;
}
free_tables(h, 0);
flush_dpb(s->avctx);
ff_MPV_common_end(s);
}
ret = get_pixel_format(h);
if (ret < 0)
return ret;
else
pix_fmt = ret;
if (s->avctx->pix_fmt == PIX_FMT_NONE)
s->avctx->pix_fmt = pix_fmt;
if (s->context_initialized &&
(s->width != s->avctx->width ||
s->height != s->avctx->height ||
pix_fmt != s->avctx->pix_fmt ||
needs_reinit ||
av_cmp_q(h->sps.sar, s->avctx->sample_aspect_ratio))) {
if (h != h0) {
av_log(s->avctx, AV_LOG_ERROR, "changing width/height on "
"slice %d\n", h0->current_slice + 1);
return AVERROR_INVALIDDATA;
}
av_log(h->s.avctx, AV_LOG_INFO, "Reinit context to %dx%d, "
"pix_fmt: %d\n", s->width, s->height, pix_fmt);
flush_change(h);
s->avctx->pix_fmt = pix_fmt;
if ((ret = h264_slice_header_init(h, 1)) < 0) {
av_log(h->s.avctx, AV_LOG_ERROR,
"h264_slice_header_init() failed\n");
return ret;
}
h->context_reinitialized = 1;
}
if (!s->context_initialized) {
if (h != h0) {
@ -2545,119 +2754,10 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
"Cannot (re-)initialize context during parallel decoding.\n");
return -1;
}
avcodec_set_dimensions(s->avctx, s->width, s->height);
s->avctx->sample_aspect_ratio = h->sps.sar;
av_assert0(s->avctx->sample_aspect_ratio.den);
if (h->sps.video_signal_type_present_flag) {
s->avctx->color_range = h->sps.full_range ? AVCOL_RANGE_JPEG
: AVCOL_RANGE_MPEG;
if (h->sps.colour_description_present_flag) {
s->avctx->color_primaries = h->sps.color_primaries;
s->avctx->color_trc = h->sps.color_trc;
s->avctx->colorspace = h->sps.colorspace;
}
}
if (h->sps.timing_info_present_flag) {
int64_t den = h->sps.time_scale;
if (h->x264_build < 44U)
den *= 2;
av_reduce(&s->avctx->time_base.num, &s->avctx->time_base.den,
h->sps.num_units_in_tick, den, 1 << 30);
}
switch (h->sps.bit_depth_luma) {
case 9:
if (CHROMA444) {
if (s->avctx->colorspace == AVCOL_SPC_RGB) {
s->avctx->pix_fmt = AV_PIX_FMT_GBRP9;
} else
s->avctx->pix_fmt = AV_PIX_FMT_YUV444P9;
} else if (CHROMA422)
s->avctx->pix_fmt = AV_PIX_FMT_YUV422P9;
else
s->avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
break;
case 10:
if (CHROMA444) {
if (s->avctx->colorspace == AVCOL_SPC_RGB) {
s->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
} else
s->avctx->pix_fmt = AV_PIX_FMT_YUV444P10;
} else if (CHROMA422)
s->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
else
s->avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
break;
case 8:
if (CHROMA444) {
if (s->avctx->colorspace == AVCOL_SPC_RGB) {
s->avctx->pix_fmt = AV_PIX_FMT_GBRP;
} else
s->avctx->pix_fmt = s->avctx->color_range == AVCOL_RANGE_JPEG ? AV_PIX_FMT_YUVJ444P
: AV_PIX_FMT_YUV444P;
} else if (CHROMA422) {
s->avctx->pix_fmt = s->avctx->color_range == AVCOL_RANGE_JPEG ? AV_PIX_FMT_YUVJ422P
: AV_PIX_FMT_YUV422P;
} else {
s->avctx->pix_fmt = s->avctx->get_format(s->avctx,
s->avctx->codec->pix_fmts ?
s->avctx->codec->pix_fmts :
s->avctx->color_range == AVCOL_RANGE_JPEG ?
hwaccel_pixfmt_list_h264_jpeg_420 :
ff_hwaccel_pixfmt_list_420);
}
break;
default:
av_log(s->avctx, AV_LOG_ERROR,
"Unsupported bit depth: %d\n", h->sps.bit_depth_luma);
return AVERROR_INVALIDDATA;
}
s->avctx->hwaccel = ff_find_hwaccel(s->avctx->codec->id,
s->avctx->pix_fmt);
if (ff_MPV_common_init(s) < 0) {
av_log(h->s.avctx, AV_LOG_ERROR, "ff_MPV_common_init() failed.\n");
return -1;
}
s->first_field = 0;
h->prev_interlaced_frame = 1;
init_scan_tables(h);
if (ff_h264_alloc_tables(h) < 0) {
if ((ret = h264_slice_header_init(h, 0)) < 0) {
av_log(h->s.avctx, AV_LOG_ERROR,
"Could not allocate memory for h264\n");
return AVERROR(ENOMEM);
}
if (!HAVE_THREADS || !(s->avctx->active_thread_type & FF_THREAD_SLICE)) {
if (context_init(h) < 0) {
av_log(h->s.avctx, AV_LOG_ERROR, "context_init() failed.\n");
return -1;
}
} else {
for (i = 1; i < s->slice_context_count; i++) {
H264Context *c;
c = h->thread_context[i] = av_malloc(sizeof(H264Context));
memcpy(c, h->s.thread_context[i], sizeof(MpegEncContext));
memset(&c->s + 1, 0, sizeof(H264Context) - sizeof(MpegEncContext));
c->h264dsp = h->h264dsp;
c->sps = h->sps;
c->pps = h->pps;
c->pixel_shift = h->pixel_shift;
init_scan_tables(c);
clone_tables(c, h, i);
}
for (i = 0; i < s->slice_context_count; i++)
if (context_init(h->thread_context[i]) < 0) {
av_log(h->s.avctx, AV_LOG_ERROR,
"context_init() failed.\n");
return -1;
}
"h264_slice_header_init() failed\n");
return ret;
}
}
@ -4097,6 +4197,7 @@ out:
decode_postinit(h, 1);
field_end(h, 0);
h->context_reinitialized = 0;
if (!h->next_output_pic) {
/* Wait for second field. */

2
libavcodec/h264.h
View File

@ -448,6 +448,8 @@ typedef struct H264Context {
int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
int got_first; ///< this flag is != 0 if we've parsed a frame
int context_reinitialized;
SPS *sps_buffers[MAX_SPS_COUNT];
PPS *pps_buffers[MAX_PPS_COUNT];