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Sunshine/third-party/cbs/cbs_jpeg.c

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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 "cbs/cbs_jpeg.h"
#include "cbs/cbs.h"
#include "cbs_internal.h"
#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 SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]) { subs, __VA_ARGS__ }) : NULL)
#define u(width, name, range_min, range_max) \
xu(width, name, range_min, range_max, 0, )
#define us(width, name, sub, range_min, range_max) \
xu(width, name, range_min, range_max, 1, sub)
#define READ
#define READWRITE read
#define RWContext GetBitContext
#define FUNC(name) cbs_jpeg_read_##name
#define xu(width, name, range_min, range_max, subs, ...) \
do { \
uint32_t value; \
CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, range_min, range_max)); \
current->name = value; \
} while(0)
#include "cbs_jpeg_syntax_template.c"
#undef READ
#undef READWRITE
#undef RWContext
#undef FUNC
#undef xu
#define WRITE
#define READWRITE write
#define RWContext PutBitContext
#define FUNC(name) cbs_jpeg_write_##name
#define xu(width, name, range_min, range_max, subs, ...) \
do { \
uint32_t value = current->name; \
CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
value, range_min, range_max)); \
} while(0)
#include "cbs_jpeg_syntax_template.c"
#undef WRITE
#undef READWRITE
#undef RWContext
#undef FUNC
#undef xu
static void cbs_jpeg_free_application_data(void *opaque, uint8_t *content) {
JPEGRawApplicationData *ad = (JPEGRawApplicationData *)content;
av_buffer_unref(&ad->Ap_ref);
av_freep(&content);
}
static void cbs_jpeg_free_comment(void *opaque, uint8_t *content) {
JPEGRawComment *comment = (JPEGRawComment *)content;
av_buffer_unref(&comment->Cm_ref);
av_freep(&content);
}
static void cbs_jpeg_free_scan(void *opaque, uint8_t *content) {
JPEGRawScan *scan = (JPEGRawScan *)content;
av_buffer_unref(&scan->data_ref);
av_freep(&content);
}
static int cbs_jpeg_split_fragment(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
int header) {
AVBufferRef *data_ref;
uint8_t *data;
size_t data_size;
int unit, start, end, marker, next_start, next_marker;
int err, i, j, length;
if(frag->data_size < 4) {
// Definitely too short to be meaningful.
return AVERROR_INVALIDDATA;
}
for(i = 0; i + 1 < frag->data_size && frag->data[i] != 0xff; i++)
;
if(i > 0) {
av_log(ctx->log_ctx, AV_LOG_WARNING, "Discarding %d bytes at "
"beginning of image.\n",
i);
}
for(++i; i + 1 < frag->data_size && frag->data[i] == 0xff; i++)
;
if(i + 1 >= frag->data_size && frag->data[i]) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid JPEG image: "
"no SOI marker found.\n");
return AVERROR_INVALIDDATA;
}
marker = frag->data[i];
if(marker != JPEG_MARKER_SOI) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid JPEG image: first "
"marker is %02x, should be SOI.\n",
marker);
return AVERROR_INVALIDDATA;
}
for(++i; i + 1 < frag->data_size && frag->data[i] == 0xff; i++)
;
if(i + 1 >= frag->data_size) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid JPEG image: "
"no image content found.\n");
return AVERROR_INVALIDDATA;
}
marker = frag->data[i];
start = i + 1;
for(unit = 0;; unit++) {
if(marker == JPEG_MARKER_EOI) {
break;
}
else if(marker == JPEG_MARKER_SOS) {
next_marker = -1;
end = start;
for(i = start; i + 1 < frag->data_size; i++) {
if(frag->data[i] != 0xff)
continue;
end = i;
for(++i; i + 1 < frag->data_size &&
frag->data[i] == 0xff;
i++)
;
if(i + 1 < frag->data_size) {
if(frag->data[i] == 0x00)
continue;
next_marker = frag->data[i];
next_start = i + 1;
}
break;
}
}
else {
i = start;
if(i + 2 > frag->data_size) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid JPEG image: "
"truncated at %02x marker.\n",
marker);
return AVERROR_INVALIDDATA;
}
length = AV_RB16(frag->data + i);
if(i + length > frag->data_size) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid JPEG image: "
"truncated at %02x marker segment.\n",
marker);
return AVERROR_INVALIDDATA;
}
end = start + length;
i = end;
if(frag->data[i] != 0xff) {
next_marker = -1;
}
else {
for(++i; i + 1 < frag->data_size &&
frag->data[i] == 0xff;
i++)
;
if(i + 1 >= frag->data_size) {
next_marker = -1;
}
else {
next_marker = frag->data[i];
next_start = i + 1;
}
}
}
if(marker == JPEG_MARKER_SOS) {
length = AV_RB16(frag->data + start);
if(length > end - start)
return AVERROR_INVALIDDATA;
data_ref = NULL;
data = av_malloc(end - start +
AV_INPUT_BUFFER_PADDING_SIZE);
if(!data)
return AVERROR(ENOMEM);
memcpy(data, frag->data + start, length);
for(i = start + length, j = length; i < end; i++, j++) {
if(frag->data[i] == 0xff) {
while(frag->data[i] == 0xff)
++i;
data[j] = 0xff;
}
else {
data[j] = frag->data[i];
}
}
data_size = j;
memset(data + data_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
}
else {
data = frag->data + start;
data_size = end - start;
data_ref = frag->data_ref;
}
err = ff_cbs_insert_unit_data(frag, unit, marker,
data, data_size, data_ref);
if(err < 0)
return err;
if(next_marker == -1)
break;
marker = next_marker;
start = next_start;
}
return 0;
}
static int cbs_jpeg_read_unit(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit) {
GetBitContext gbc;
int err;
err = init_get_bits(&gbc, unit->data, 8 * unit->data_size);
if(err < 0)
return err;
if(unit->type >= JPEG_MARKER_SOF0 &&
unit->type <= JPEG_MARKER_SOF3) {
err = ff_cbs_alloc_unit_content(unit,
sizeof(JPEGRawFrameHeader),
NULL);
if(err < 0)
return err;
err = cbs_jpeg_read_frame_header(ctx, &gbc, unit->content);
if(err < 0)
return err;
}
else if(unit->type >= JPEG_MARKER_APPN &&
unit->type <= JPEG_MARKER_APPN + 15) {
err = ff_cbs_alloc_unit_content(unit,
sizeof(JPEGRawApplicationData),
&cbs_jpeg_free_application_data);
if(err < 0)
return err;
err = cbs_jpeg_read_application_data(ctx, &gbc, unit->content);
if(err < 0)
return err;
}
else if(unit->type == JPEG_MARKER_SOS) {
JPEGRawScan *scan;
int pos;
err = ff_cbs_alloc_unit_content(unit,
sizeof(JPEGRawScan),
&cbs_jpeg_free_scan);
if(err < 0)
return err;
scan = unit->content;
err = cbs_jpeg_read_scan_header(ctx, &gbc, &scan->header);
if(err < 0)
return err;
pos = get_bits_count(&gbc);
av_assert0(pos % 8 == 0);
if(pos > 0) {
scan->data_size = unit->data_size - pos / 8;
scan->data_ref = av_buffer_ref(unit->data_ref);
if(!scan->data_ref)
return AVERROR(ENOMEM);
scan->data = unit->data + pos / 8;
}
}
else {
switch(unit->type) {
#define SEGMENT(marker, type, func, free) \
case JPEG_MARKER_##marker: { \
err = ff_cbs_alloc_unit_content(unit, \
sizeof(type), free); \
if(err < 0) \
return err; \
err = cbs_jpeg_read_##func(ctx, &gbc, unit->content); \
if(err < 0) \
return err; \
} break
SEGMENT(DQT, JPEGRawQuantisationTableSpecification, dqt, NULL);
SEGMENT(DHT, JPEGRawHuffmanTableSpecification, dht, NULL);
SEGMENT(COM, JPEGRawComment, comment, &cbs_jpeg_free_comment);
#undef SEGMENT
default:
return AVERROR(ENOSYS);
}
}
return 0;
}
static int cbs_jpeg_write_scan(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit,
PutBitContext *pbc) {
JPEGRawScan *scan = unit->content;
int err;
err = cbs_jpeg_write_scan_header(ctx, pbc, &scan->header);
if(err < 0)
return err;
if(scan->data) {
if(scan->data_size * 8 > put_bits_left(pbc))
return AVERROR(ENOSPC);
av_assert0(put_bits_count(pbc) % 8 == 0);
flush_put_bits(pbc);
memcpy(put_bits_ptr(pbc), scan->data, scan->data_size);
skip_put_bytes(pbc, scan->data_size);
}
return 0;
}
static int cbs_jpeg_write_segment(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit,
PutBitContext *pbc) {
int err;
if(unit->type >= JPEG_MARKER_SOF0 &&
unit->type <= JPEG_MARKER_SOF3) {
err = cbs_jpeg_write_frame_header(ctx, pbc, unit->content);
}
else if(unit->type >= JPEG_MARKER_APPN &&
unit->type <= JPEG_MARKER_APPN + 15) {
err = cbs_jpeg_write_application_data(ctx, pbc, unit->content);
}
else {
switch(unit->type) {
#define SEGMENT(marker, func) \
case JPEG_MARKER_##marker: \
err = cbs_jpeg_write_##func(ctx, pbc, unit->content); \
break;
SEGMENT(DQT, dqt);
SEGMENT(DHT, dht);
SEGMENT(COM, comment);
default:
return AVERROR_PATCHWELCOME;
}
}
return err;
}
static int cbs_jpeg_write_unit(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit,
PutBitContext *pbc) {
if(unit->type == JPEG_MARKER_SOS)
return cbs_jpeg_write_scan(ctx, unit, pbc);
else
return cbs_jpeg_write_segment(ctx, unit, pbc);
}
static int cbs_jpeg_assemble_fragment(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag) {
const CodedBitstreamUnit *unit;
uint8_t *data;
size_t size, dp, sp;
int i;
size = 4; // SOI + EOI.
for(i = 0; i < frag->nb_units; i++) {
unit = &frag->units[i];
size += 2 + unit->data_size;
if(unit->type == JPEG_MARKER_SOS) {
for(sp = 0; sp < unit->data_size; sp++) {
if(unit->data[sp] == 0xff)
++size;
}
}
}
frag->data_ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
if(!frag->data_ref)
return AVERROR(ENOMEM);
data = frag->data_ref->data;
dp = 0;
data[dp++] = 0xff;
data[dp++] = JPEG_MARKER_SOI;
for(i = 0; i < frag->nb_units; i++) {
unit = &frag->units[i];
data[dp++] = 0xff;
data[dp++] = unit->type;
if(unit->type != JPEG_MARKER_SOS) {
memcpy(data + dp, unit->data, unit->data_size);
dp += unit->data_size;
}
else {
sp = AV_RB16(unit->data);
av_assert0(sp <= unit->data_size);
memcpy(data + dp, unit->data, sp);
dp += sp;
for(; sp < unit->data_size; sp++) {
if(unit->data[sp] == 0xff) {
data[dp++] = 0xff;
data[dp++] = 0x00;
}
else {
data[dp++] = unit->data[sp];
}
}
}
}
data[dp++] = 0xff;
data[dp++] = JPEG_MARKER_EOI;
av_assert0(dp == size);
memset(data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
frag->data = data;
frag->data_size = size;
return 0;
}
const CodedBitstreamType ff_cbs_type_jpeg = {
.codec_id = AV_CODEC_ID_MJPEG,
.split_fragment = &cbs_jpeg_split_fragment,
.read_unit = &cbs_jpeg_read_unit,
.write_unit = &cbs_jpeg_write_unit,
.assemble_fragment = &cbs_jpeg_assemble_fragment,
};
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