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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
*/
static int FUNC(frame_header)(CodedBitstreamContext *ctx, RWContext *rw,
JPEGRawFrameHeader *current)
{
int err, i;
HEADER("Frame Header");
u(16, Lf, 8, 8 + 3 * JPEG_MAX_COMPONENTS);
u(8, P, 2, 16);
u(16, Y, 0, JPEG_MAX_HEIGHT);
u(16, X, 1, JPEG_MAX_WIDTH);
u(8, Nf, 1, JPEG_MAX_COMPONENTS);
for (i = 0; i < current->Nf; i++) {
us(8, C[i], i, 0, JPEG_MAX_COMPONENTS);
us(4, H[i], i, 1, 4);
us(4, V[i], i, 1, 4);
us(8, Tq[i], i, 0, 3);
}
return 0;
}
static int FUNC(quantisation_table)(CodedBitstreamContext *ctx, RWContext *rw,
JPEGRawQuantisationTable *current)
{
int err, i;
u(4, Pq, 0, 1);
u(4, Tq, 0, 3);
if (current->Pq) {
for (i = 0; i < 64; i++)
us(16, Q[i], i, 1, 255);
} else {
for (i = 0; i < 64; i++)
us(8, Q[i], i, 1, 255);
}
return 0;
}
static int FUNC(dqt)(CodedBitstreamContext *ctx, RWContext *rw,
JPEGRawQuantisationTableSpecification *current)
{
int err, i, n;
HEADER("Quantisation Tables");
u(16, Lq, 2, 2 + 4 * 65);
n = current->Lq / 65;
for (i = 0; i < n; i++)
CHECK(FUNC(quantisation_table)(ctx, rw, ¤t->table[i]));
return 0;
}
static int FUNC(huffman_table)(CodedBitstreamContext *ctx, RWContext *rw,
JPEGRawHuffmanTable *current)
{
int err, i, j, ij;
u(4, Tc, 0, 1);
u(4, Th, 0, 3);
for (i = 0; i < 16; i++)
us(8, L[i], i, 0, 255);
ij = 0;
for (i = 0; i < 16; i++) {
for (j = 0; j < current->L[i]; j++) {
if (ij >= FF_ARRAY_ELEMS(current->V))
return AVERROR_INVALIDDATA;
us(8, V[ij], ij, 0, 255);
++ij;
}
}
return 0;
}
static int FUNC(dht)(CodedBitstreamContext *ctx, RWContext *rw,
JPEGRawHuffmanTableSpecification *current)
{
int err, i, j, n;
HEADER("Huffman Tables");
u(16, Lh, 2, 2 + 8 * (1 + 16 + 256));
n = 2;
for (i = 0; n < current->Lh; i++) {
if (i >= 8)
return AVERROR_INVALIDDATA;
CHECK(FUNC(huffman_table)(ctx, rw, ¤t->table[i]));
++n;
for (j = 0; j < 16; j++)
n += 1 + current->table[i].L[j];
}
return 0;
}
static int FUNC(scan_header)(CodedBitstreamContext *ctx, RWContext *rw,
JPEGRawScanHeader *current)
{
int err, j;
HEADER("Scan");
u(16, Ls, 6, 6 + 2 * JPEG_MAX_COMPONENTS);
u(8, Ns, 1, 4);
for (j = 0; j < current->Ns; j++) {
us(8, Cs[j], j, 0, JPEG_MAX_COMPONENTS);
us(4, Td[j], j, 0, 3);
us(4, Ta[j], j, 0, 3);
}
u(8, Ss, 0, 63);
u(8, Se, 0, 63);
u(4, Ah, 0, 13);
u(4, Al, 0, 15);
return 0;
}
static int FUNC(application_data)(CodedBitstreamContext *ctx, RWContext *rw,
JPEGRawApplicationData *current)
{
int err, i;
HEADER("Application Data");
u(16, Lp, 2, 65535);
if (current->Lp > 2) {
#ifdef READ
current->Ap_ref = av_buffer_alloc(current->Lp - 2);
if (!current->Ap_ref)
return AVERROR(ENOMEM);
current->Ap = current->Ap_ref->data;
#endif
for (i = 0; i < current->Lp - 2; i++)
us(8, Ap[i], i, 0, 255);
}
return 0;
}
static int FUNC(comment)(CodedBitstreamContext *ctx, RWContext *rw,
JPEGRawComment *current)
{
int err, i;
HEADER("Comment");
u(16, Lc, 2, 65535);
if (current->Lc > 2) {
#ifdef READ
current->Cm_ref = av_buffer_alloc(current->Lc - 2);
if (!current->Cm_ref)
return AVERROR(ENOMEM);
current->Cm = current->Cm_ref->data;
#endif
for (i = 0; i < current->Lc - 2; i++)
us(8, Cm[i], i, 0, 255);
}
return 0;
}
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