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FFmpeg/libavcodec/cbs_vp9.c
Mark Thompson abe16daea1 cbs: Make tracing more general 
Turn tracing into callbacks for each syntax element, with default
callbacks to match current trace_headers behaviour for debug.  Move
the construction of bit strings into the trace callback, which
simplifies all of the read and write functions.

Signed-off-by: Fei Wang <fei.w.wang@intel.com>
Reviewed-by: Neal Gompa <ngompa13@gmail.com>
2023-09-22 13:15:00 +08:00

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/*
* 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/avassert.h"
#include "cbs.h"
#include "cbs_internal.h"
#include "cbs_vp9.h"
static int cbs_vp9_read_s(CodedBitstreamContext *ctx, GetBitContext *gbc,
int width, const char *name,
const int *subscripts, int32_t *write_to)
{
uint32_t magnitude;
int sign;
int32_t value;
CBS_TRACE_READ_START();
if (get_bits_left(gbc) < width + 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid signed value at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
magnitude = get_bits(gbc, width);
sign = get_bits1(gbc);
value = sign ? -(int32_t)magnitude : magnitude;
CBS_TRACE_READ_END();
*write_to = value;
return 0;
}
static int cbs_vp9_write_s(CodedBitstreamContext *ctx, PutBitContext *pbc,
int width, const char *name,
const int *subscripts, int32_t value)
{
uint32_t magnitude;
int sign;
CBS_TRACE_WRITE_START();
if (put_bits_left(pbc) < width + 1)
return AVERROR(ENOSPC);
sign = value < 0;
magnitude = sign ? -value : value;
put_bits(pbc, width, magnitude);
put_bits(pbc, 1, sign);
CBS_TRACE_WRITE_END();
return 0;
}
static int cbs_vp9_read_increment(CodedBitstreamContext *ctx, GetBitContext *gbc,
uint32_t range_min, uint32_t range_max,
const char *name, uint32_t *write_to)
{
uint32_t value;
CBS_TRACE_READ_START();
av_assert0(range_min <= range_max && range_max - range_min < 32);
for (value = range_min; value < range_max;) {
if (get_bits_left(gbc) < 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid increment value at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
if (get_bits1(gbc))
++value;
else
break;
}
CBS_TRACE_READ_END_NO_SUBSCRIPTS();
*write_to = value;
return 0;
}
static int cbs_vp9_write_increment(CodedBitstreamContext *ctx, PutBitContext *pbc,
uint32_t range_min, uint32_t range_max,
const char *name, uint32_t value)
{
int len;
CBS_TRACE_WRITE_START();
av_assert0(range_min <= range_max && range_max - range_min < 8);
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 (value == range_max)
len = range_max - range_min;
else
len = value - range_min + 1;
if (put_bits_left(pbc) < len)
return AVERROR(ENOSPC);
if (len > 0)
put_bits(pbc, len, (1 << len) - 1 - (value != range_max));
CBS_TRACE_WRITE_END_NO_SUBSCRIPTS();
return 0;
}
static int cbs_vp9_read_le(CodedBitstreamContext *ctx, GetBitContext *gbc,
int width, const char *name,
const int *subscripts, uint32_t *write_to)
{
uint32_t value;
int b;
CBS_TRACE_READ_START();
av_assert0(width % 8 == 0);
if (get_bits_left(gbc) < width) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid le value at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
value = 0;
for (b = 0; b < width; b += 8)
value |= get_bits(gbc, 8) << b;
CBS_TRACE_READ_END();
*write_to = value;
return 0;
}
static int cbs_vp9_write_le(CodedBitstreamContext *ctx, PutBitContext *pbc,
int width, const char *name,
const int *subscripts, uint32_t value)
{
int b;
CBS_TRACE_WRITE_START();
av_assert0(width % 8 == 0);
if (put_bits_left(pbc) < width)
return AVERROR(ENOSPC);
for (b = 0; b < width; b += 8)
put_bits(pbc, 8, value >> b & 0xff);
CBS_TRACE_WRITE_END();
return 0;
}
#define HEADER(name) do { \
ff_cbs_trace_header(ctx, name); \
} while (0)
#define CHECK(call) do { \
err = (call); \
if (err < 0) \
return err; \
} while (0)
#define FUNC_NAME(rw, codec, name) cbs_ ## codec ## _ ## rw ## _ ## name
#define FUNC_VP9(rw, name) FUNC_NAME(rw, vp9, name)
#define FUNC(name) FUNC_VP9(READWRITE, name)
#define SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL)
#define s(width, name) \
xs(width, name, current->name, 0, )
#define fs(width, name, subs, ...) \
xf(width, name, current->name, subs, __VA_ARGS__)
#define ss(width, name, subs, ...) \
xs(width, name, current->name, subs, __VA_ARGS__)
#define READ
#define READWRITE read
#define RWContext GetBitContext
#define f(width, name) do { \
uint32_t value; \
CHECK(ff_cbs_read_simple_unsigned(ctx, rw, width, #name, \
&value)); \
current->name = value; \
} while (0)
#define xf(width, name, var, subs, ...) do { \
uint32_t value; \
CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, 0, (1 << width) - 1)); \
var = value; \
} while (0)
#define xs(width, name, var, subs, ...) do { \
int32_t value; \
CHECK(cbs_vp9_read_s(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
var = value; \
} while (0)
#define increment(name, min, max) do { \
uint32_t value; \
CHECK(cbs_vp9_read_increment(ctx, rw, min, max, #name, &value)); \
current->name = value; \
} while (0)
#define fle(width, name, subs, ...) do { \
CHECK(cbs_vp9_read_le(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), &current->name)); \
} while (0)
#define delta_q(name) do { \
uint8_t delta_coded; \
int8_t delta_q; \
xf(1, name.delta_coded, delta_coded, 0, ); \
if (delta_coded) \
xs(4, name.delta_q, delta_q, 0, ); \
else \
delta_q = 0; \
current->name = delta_q; \
} while (0)
#define prob(name, subs, ...) do { \
uint8_t prob_coded; \
uint8_t prob; \
xf(1, name.prob_coded, prob_coded, subs, __VA_ARGS__); \
if (prob_coded) \
xf(8, name.prob, prob, subs, __VA_ARGS__); \
else \
prob = 255; \
current->name = prob; \
} while (0)
#define fixed(width, name, value) do { \
av_unused uint32_t fixed_value; \
CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
0, &fixed_value, value, value)); \
} while (0)
#define infer(name, value) do { \
current->name = value; \
} while (0)
#define byte_alignment(rw) (get_bits_count(rw) % 8)
#include "cbs_vp9_syntax_template.c"
#undef READ
#undef READWRITE
#undef RWContext
#undef f
#undef xf
#undef xs
#undef increment
#undef fle
#undef delta_q
#undef prob
#undef fixed
#undef infer
#undef byte_alignment
#define WRITE
#define READWRITE write
#define RWContext PutBitContext
#define f(width, name) do { \
CHECK(ff_cbs_write_simple_unsigned(ctx, rw, width, #name, \
current->name)); \
} while (0)
#define xf(width, name, var, subs, ...) do { \
CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
var, 0, (1 << width) - 1)); \
} while (0)
#define xs(width, name, var, subs, ...) do { \
CHECK(cbs_vp9_write_s(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), var)); \
} while (0)
#define increment(name, min, max) do { \
CHECK(cbs_vp9_write_increment(ctx, rw, min, max, #name, current->name)); \
} while (0)
#define fle(width, name, subs, ...) do { \
CHECK(cbs_vp9_write_le(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), current->name)); \
} while (0)
#define delta_q(name) do { \
xf(1, name.delta_coded, !!current->name, 0, ); \
if (current->name) \
xs(4, name.delta_q, current->name, 0, ); \
} while (0)
#define prob(name, subs, ...) do { \
xf(1, name.prob_coded, current->name != 255, subs, __VA_ARGS__); \
if (current->name != 255) \
xf(8, name.prob, current->name, subs, __VA_ARGS__); \
} while (0)
#define fixed(width, name, value) do { \
CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
0, value, value, value)); \
} while (0)
#define infer(name, value) do { \
if (current->name != (value)) { \
av_log(ctx->log_ctx, AV_LOG_WARNING, "Warning: " \
"%s does not match inferred value: " \
"%"PRId64", but should be %"PRId64".\n", \
#name, (int64_t)current->name, (int64_t)(value)); \
} \
} while (0)
#define byte_alignment(rw) (put_bits_count(rw) % 8)
#include "cbs_vp9_syntax_template.c"
#undef WRITE
#undef READWRITE
#undef RWContext
#undef f
#undef xf
#undef xs
#undef increment
#undef fle
#undef delta_q
#undef prob
#undef fixed
#undef infer
#undef byte_alignment
static int cbs_vp9_split_fragment(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
int header)
{
uint8_t superframe_header;
int err;
if (frag->data_size == 0)
return AVERROR_INVALIDDATA;
// Last byte in the packet.
superframe_header = frag->data[frag->data_size - 1];
if ((superframe_header & 0xe0) == 0xc0) {
VP9RawSuperframeIndex sfi;
GetBitContext gbc;
size_t index_size, pos;
int i;
index_size = 2 + (((superframe_header & 0x18) >> 3) + 1) *
((superframe_header & 0x07) + 1);
if (index_size > frag->data_size)
return AVERROR_INVALIDDATA;
err = init_get_bits(&gbc, frag->data + frag->data_size - index_size,
8 * index_size);
if (err < 0)
return err;
err = cbs_vp9_read_superframe_index(ctx, &gbc, &sfi);
if (err < 0)
return err;
pos = 0;
for (i = 0; i <= sfi.frames_in_superframe_minus_1; i++) {
if (pos + sfi.frame_sizes[i] + index_size > frag->data_size) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Frame %d too large "
"in superframe: %"PRIu32" bytes.\n",
i, sfi.frame_sizes[i]);
return AVERROR_INVALIDDATA;
}
err = ff_cbs_append_unit_data(frag, 0,
frag->data + pos,
sfi.frame_sizes[i],
frag->data_ref);
if (err < 0)
return err;
pos += sfi.frame_sizes[i];
}
if (pos + index_size != frag->data_size) {
av_log(ctx->log_ctx, AV_LOG_WARNING, "Extra padding at "
"end of superframe: %"SIZE_SPECIFIER" bytes.\n",
frag->data_size - (pos + index_size));
}
return 0;
} else {
err = ff_cbs_append_unit_data(frag, 0,
frag->data, frag->data_size,
frag->data_ref);
if (err < 0)
return err;
}
return 0;
}
static int cbs_vp9_read_unit(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit)
{
VP9RawFrame *frame;
GetBitContext gbc;
int err, pos;
err = init_get_bits(&gbc, unit->data, 8 * unit->data_size);
if (err < 0)
return err;
err = ff_cbs_alloc_unit_content(ctx, unit);
if (err < 0)
return err;
frame = unit->content;
err = cbs_vp9_read_frame(ctx, &gbc, frame);
if (err < 0)
return err;
pos = get_bits_count(&gbc);
av_assert0(pos % 8 == 0);
pos /= 8;
av_assert0(pos <= unit->data_size);
if (pos == unit->data_size) {
// No data (e.g. a show-existing-frame frame).
} else {
frame->data_ref = av_buffer_ref(unit->data_ref);
if (!frame->data_ref)
return AVERROR(ENOMEM);
frame->data = unit->data + pos;
frame->data_size = unit->data_size - pos;
}
return 0;
}
static int cbs_vp9_write_unit(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit,
PutBitContext *pbc)
{
VP9RawFrame *frame = unit->content;
int err;
err = cbs_vp9_write_frame(ctx, pbc, frame);
if (err < 0)
return err;
// Frame must be byte-aligned.
av_assert0(put_bits_count(pbc) % 8 == 0);
if (frame->data) {
if (frame->data_size > put_bits_left(pbc) / 8)
return AVERROR(ENOSPC);
flush_put_bits(pbc);
memcpy(put_bits_ptr(pbc), frame->data, frame->data_size);
skip_put_bytes(pbc, frame->data_size);
}
return 0;
}
static int cbs_vp9_assemble_fragment(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag)
{
int err;
if (frag->nb_units == 1) {
// Output is just the content of the single frame.
CodedBitstreamUnit *frame = &frag->units[0];
frag->data_ref = av_buffer_ref(frame->data_ref);
if (!frag->data_ref)
return AVERROR(ENOMEM);
frag->data = frame->data;
frag->data_size = frame->data_size;
} else {
// Build superframe out of frames.
VP9RawSuperframeIndex sfi;
PutBitContext pbc;
AVBufferRef *ref;
uint8_t *data;
size_t size, max, pos;
int i, size_len;
if (frag->nb_units > 8) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many frames to "
"make superframe: %d.\n", frag->nb_units);
return AVERROR(EINVAL);
}
max = 0;
for (i = 0; i < frag->nb_units; i++)
if (max < frag->units[i].data_size)
max = frag->units[i].data_size;
if (max < 2)
size_len = 1;
else
size_len = av_log2(max) / 8 + 1;
av_assert0(size_len <= 4);
sfi.superframe_marker = VP9_SUPERFRAME_MARKER;
sfi.bytes_per_framesize_minus_1 = size_len - 1;
sfi.frames_in_superframe_minus_1 = frag->nb_units - 1;
size = 2;
for (i = 0; i < frag->nb_units; i++) {
size += size_len + frag->units[i].data_size;
sfi.frame_sizes[i] = frag->units[i].data_size;
}
ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!ref)
return AVERROR(ENOMEM);
data = ref->data;
memset(data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
pos = 0;
for (i = 0; i < frag->nb_units; i++) {
av_assert0(size - pos > frag->units[i].data_size);
memcpy(data + pos, frag->units[i].data,
frag->units[i].data_size);
pos += frag->units[i].data_size;
}
av_assert0(size - pos == 2 + frag->nb_units * size_len);
init_put_bits(&pbc, data + pos, size - pos);
err = cbs_vp9_write_superframe_index(ctx, &pbc, &sfi);
if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to write "
"superframe index.\n");
av_buffer_unref(&ref);
return err;
}
av_assert0(put_bits_left(&pbc) == 0);
flush_put_bits(&pbc);
frag->data_ref = ref;
frag->data = data;
frag->data_size = size;
}
return 0;
}
static void cbs_vp9_flush(CodedBitstreamContext *ctx)
{
CodedBitstreamVP9Context *vp9 = ctx->priv_data;
memset(vp9->ref, 0, sizeof(vp9->ref));
}
static const CodedBitstreamUnitTypeDescriptor cbs_vp9_unit_types[] = {
CBS_UNIT_TYPE_INTERNAL_REF(0, VP9RawFrame, data),
CBS_UNIT_TYPE_END_OF_LIST
};
const CodedBitstreamType ff_cbs_type_vp9 = {
.codec_id = AV_CODEC_ID_VP9,
.priv_data_size = sizeof(CodedBitstreamVP9Context),
.unit_types = cbs_vp9_unit_types,
.split_fragment = &cbs_vp9_split_fragment,
.read_unit = &cbs_vp9_read_unit,
.write_unit = &cbs_vp9_write_unit,
.flush = &cbs_vp9_flush,
.assemble_fragment = &cbs_vp9_assemble_fragment,
};
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