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FFmpeg/libavcodec/cbs.c
Mark Thompson 44cde38c8a cbs: Always check for bitstream end before reading
2017-09-12 22:11:41 +01:00

476 lines
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/*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include "config.h"
#include "libavutil/avassert.h"
#include "libavutil/common.h"
#include "cbs.h"
#include "cbs_internal.h"
static const CodedBitstreamType *cbs_type_table[] = {
#if CONFIG_CBS_H264
&ff_cbs_type_h264,
#endif
#if CONFIG_CBS_H265
&ff_cbs_type_h265,
#endif
#if CONFIG_CBS_MPEG2
&ff_cbs_type_mpeg2,
#endif
};
int ff_cbs_init(CodedBitstreamContext *ctx,
enum AVCodecID codec_id, void *log_ctx)
{
const CodedBitstreamType *type;
int i;
type = NULL;
for (i = 0; i < FF_ARRAY_ELEMS(cbs_type_table); i++) {
if (cbs_type_table[i]->codec_id == codec_id) {
type = cbs_type_table[i];
break;
}
}
if (!type)
return AVERROR(EINVAL);
ctx->log_ctx = log_ctx;
ctx->codec = type;
ctx->priv_data = av_mallocz(ctx->codec->priv_data_size);
if (!ctx->priv_data)
return AVERROR(ENOMEM);
ctx->decompose_unit_types = NULL;
ctx->trace_enable = 0;
ctx->trace_level = AV_LOG_TRACE;
return 0;
}
void ff_cbs_close(CodedBitstreamContext *ctx)
{
if (ctx->codec && ctx->codec->close)
ctx->codec->close(ctx);
av_freep(&ctx->priv_data);
}
static void cbs_unit_uninit(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit)
{
if (ctx->codec->free_unit && unit->content && !unit->content_external)
ctx->codec->free_unit(unit);
av_freep(&unit->data);
unit->data_size = 0;
unit->data_bit_padding = 0;
}
void ff_cbs_fragment_uninit(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag)
{
int i;
for (i = 0; i < frag->nb_units; i++)
cbs_unit_uninit(ctx, &frag->units[i]);
av_freep(&frag->units);
frag->nb_units = 0;
av_freep(&frag->data);
frag->data_size = 0;
frag->data_bit_padding = 0;
}
static int cbs_read_fragment_content(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag)
{
int err, i, j;
for (i = 0; i < frag->nb_units; i++) {
if (ctx->decompose_unit_types) {
for (j = 0; j < ctx->nb_decompose_unit_types; j++) {
if (ctx->decompose_unit_types[j] == frag->units[i].type)
break;
}
if (j >= ctx->nb_decompose_unit_types)
continue;
}
err = ctx->codec->read_unit(ctx, &frag->units[i]);
if (err == AVERROR(ENOSYS)) {
av_log(ctx->log_ctx, AV_LOG_WARNING,
"Decomposition unimplemented for unit %d "
"(type %d).\n", i, frag->units[i].type);
} else if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to read unit %d "
"(type %d).\n", i, frag->units[i].type);
return err;
}
}
return 0;
}
int ff_cbs_read_extradata(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
const AVCodecParameters *par)
{
int err;
memset(frag, 0, sizeof(*frag));
frag->data = par->extradata;
frag->data_size = par->extradata_size;
err = ctx->codec->split_fragment(ctx, frag, 1);
if (err < 0)
return err;
frag->data = NULL;
frag->data_size = 0;
return cbs_read_fragment_content(ctx, frag);
}
int ff_cbs_read_packet(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
const AVPacket *pkt)
{
int err;
memset(frag, 0, sizeof(*frag));
frag->data = pkt->data;
frag->data_size = pkt->size;
err = ctx->codec->split_fragment(ctx, frag, 0);
if (err < 0)
return err;
frag->data = NULL;
frag->data_size = 0;
return cbs_read_fragment_content(ctx, frag);
}
int ff_cbs_read(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
const uint8_t *data, size_t size)
{
int err;
memset(frag, 0, sizeof(*frag));
// (We won't write to this during split.)
frag->data = (uint8_t*)data;
frag->data_size = size;
err = ctx->codec->split_fragment(ctx, frag, 0);
if (err < 0)
return err;
frag->data = NULL;
frag->data_size = 0;
return cbs_read_fragment_content(ctx, frag);
}
int ff_cbs_write_fragment_data(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag)
{
int err, i;
for (i = 0; i < frag->nb_units; i++) {
if (!frag->units[i].content)
continue;
err = ctx->codec->write_unit(ctx, &frag->units[i]);
if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to write unit %d "
"(type %d).\n", i, frag->units[i].type);
return err;
}
}
err = ctx->codec->assemble_fragment(ctx, frag);
if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to assemble fragment.\n");
return err;
}
return 0;
}
int ff_cbs_write_extradata(CodedBitstreamContext *ctx,
AVCodecParameters *par,
CodedBitstreamFragment *frag)
{
int err;
err = ff_cbs_write_fragment_data(ctx, frag);
if (err < 0)
return err;
av_freep(&par->extradata);
par->extradata = av_malloc(frag->data_size +
AV_INPUT_BUFFER_PADDING_SIZE);
if (!par->extradata)
return AVERROR(ENOMEM);
memcpy(par->extradata, frag->data, frag->data_size);
memset(par->extradata + frag->data_size, 0,
AV_INPUT_BUFFER_PADDING_SIZE);
par->extradata_size = frag->data_size;
return 0;
}
int ff_cbs_write_packet(CodedBitstreamContext *ctx,
AVPacket *pkt,
CodedBitstreamFragment *frag)
{
int err;
err = ff_cbs_write_fragment_data(ctx, frag);
if (err < 0)
return err;
av_new_packet(pkt, frag->data_size);
if (err < 0)
return err;
memcpy(pkt->data, frag->data, frag->data_size);
pkt->size = frag->data_size;
return 0;
}
void ff_cbs_trace_header(CodedBitstreamContext *ctx,
const char *name)
{
if (!ctx->trace_enable)
return;
av_log(ctx->log_ctx, ctx->trace_level, "%s\n", name);
}
void ff_cbs_trace_syntax_element(CodedBitstreamContext *ctx, int position,
const char *name, const char *bits,
int64_t value)
{
size_t name_len, bits_len;
int pad;
if (!ctx->trace_enable)
return;
av_assert0(value >= INT_MIN && value <= UINT32_MAX);
name_len = strlen(name);
bits_len = strlen(bits);
if (name_len + bits_len > 60)
pad = bits_len + 2;
else
pad = 61 - name_len;
av_log(ctx->log_ctx, ctx->trace_level, "%-10d %s%*s = %"PRId64"\n",
position, name, pad, bits, value);
}
int ff_cbs_read_unsigned(CodedBitstreamContext *ctx, BitstreamContext *bc,
int width, const char *name, uint32_t *write_to,
uint32_t range_min, uint32_t range_max)
{
uint32_t value;
int position;
av_assert0(width <= 32);
if (bitstream_bits_left(bc) < width) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
if (ctx->trace_enable)
position = bitstream_tell(bc);
value = bitstream_read(bc, width);
if (ctx->trace_enable) {
char bits[33];
int i;
for (i = 0; i < width; i++)
bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
bits[i] = 0;
ff_cbs_trace_syntax_element(ctx, position, name, bits, value);
}
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
name, value, range_min, range_max);
return AVERROR_INVALIDDATA;
}
*write_to = value;
return 0;
}
int ff_cbs_write_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
int width, const char *name, uint32_t value,
uint32_t range_min, uint32_t range_max)
{
av_assert0(width <= 32);
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
name, value, range_min, range_max);
return AVERROR_INVALIDDATA;
}
if (put_bits_left(pbc) < width)
return AVERROR(ENOSPC);
if (ctx->trace_enable) {
char bits[33];
int i;
for (i = 0; i < width; i++)
bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
bits[i] = 0;
ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc), name, bits, value);
}
if (width < 32)
put_bits(pbc, width, value);
else
put_bits32(pbc, value);
return 0;
}
static int cbs_insert_unit(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
int position)
{
CodedBitstreamUnit *units;
units = av_malloc_array(frag->nb_units + 1, sizeof(*units));
if (!units)
return AVERROR(ENOMEM);
if (position > 0)
memcpy(units, frag->units, position * sizeof(*units));
if (position < frag->nb_units)
memcpy(units + position + 1, frag->units + position,
(frag->nb_units - position) * sizeof(*units));
memset(units + position, 0, sizeof(*units));
av_freep(&frag->units);
frag->units = units;
++frag->nb_units;
return 0;
}
int ff_cbs_insert_unit_content(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
int position, uint32_t type,
void *content)
{
int err;
if (position == -1)
position = frag->nb_units;
av_assert0(position >= 0 && position <= frag->nb_units);
err = cbs_insert_unit(ctx, frag, position);
if (err < 0)
return err;
frag->units[position].type = type;
frag->units[position].content = content;
frag->units[position].content_external = 1;
return 0;
}
int ff_cbs_insert_unit_data(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
int position, uint32_t type,
uint8_t *data, size_t data_size)
{
int err;
if (position == -1)
position = frag->nb_units;
av_assert0(position >= 0 && position <= frag->nb_units);
err = cbs_insert_unit(ctx, frag, position);
if (err < 0)
return err;
frag->units[position].type = type;
frag->units[position].data = data;
frag->units[position].data_size = data_size;
return 0;
}
int ff_cbs_delete_unit(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
int position)
{
if (position < 0 || position >= frag->nb_units)
return AVERROR(EINVAL);
cbs_unit_uninit(ctx, &frag->units[position]);
--frag->nb_units;
if (frag->nb_units == 0) {
av_freep(&frag->units);
} else {
memmove(frag->units + position,
frag->units + position + 1,
(frag->nb_units - position) * sizeof(*frag->units));
// Don't bother reallocating the unit array.
}
return 0;
}
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