mirror of https://git.ffmpeg.org/ffmpeg.git
386 lines
11 KiB
C
386 lines
11 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
static int FUNC(sequence_header)(CodedBitstreamContext *ctx, RWContext *rw,
|
|
MPEG2RawSequenceHeader *current)
|
|
{
|
|
CodedBitstreamMPEG2Context *mpeg2 = ctx->priv_data;
|
|
int err, i;
|
|
|
|
HEADER("Sequence Header");
|
|
|
|
ui(8, sequence_header_code);
|
|
|
|
ui(12, horizontal_size_value);
|
|
ui(12, vertical_size_value);
|
|
|
|
mpeg2->horizontal_size = current->horizontal_size_value;
|
|
mpeg2->vertical_size = current->vertical_size_value;
|
|
|
|
ui(4, aspect_ratio_information);
|
|
ui(4, frame_rate_code);
|
|
ui(18, bit_rate_value);
|
|
|
|
marker_bit();
|
|
|
|
ui(10, vbv_buffer_size_value);
|
|
ui(1, constrained_parameters_flag);
|
|
|
|
ui(1, load_intra_quantiser_matrix);
|
|
if (current->load_intra_quantiser_matrix) {
|
|
for (i = 0; i < 64; i++)
|
|
ui(8, intra_quantiser_matrix[i]);
|
|
}
|
|
|
|
ui(1, load_non_intra_quantiser_matrix);
|
|
if (current->load_non_intra_quantiser_matrix) {
|
|
for (i = 0; i < 64; i++)
|
|
ui(8, non_intra_quantiser_matrix[i]);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int FUNC(user_data)(CodedBitstreamContext *ctx, RWContext *rw,
|
|
MPEG2RawUserData *current)
|
|
{
|
|
size_t k;
|
|
int err;
|
|
|
|
HEADER("User Data");
|
|
|
|
ui(8, user_data_start_code);
|
|
|
|
#ifdef READ
|
|
k = bitstream_bits_left(rw);
|
|
av_assert0(k % 8 == 0);
|
|
current->user_data_length = k /= 8;
|
|
if (k > 0) {
|
|
current->user_data_ref = av_buffer_alloc(k);
|
|
if (!current->user_data_ref)
|
|
return AVERROR(ENOMEM);
|
|
current->user_data = current->user_data_ref->data;
|
|
}
|
|
#endif
|
|
|
|
for (k = 0; k < current->user_data_length; k++)
|
|
xui(8, user_data, current->user_data[k]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int FUNC(sequence_extension)(CodedBitstreamContext *ctx, RWContext *rw,
|
|
MPEG2RawSequenceExtension *current)
|
|
{
|
|
CodedBitstreamMPEG2Context *mpeg2 = ctx->priv_data;
|
|
int err;
|
|
|
|
HEADER("Sequence Extension");
|
|
|
|
ui(8, profile_and_level_indication);
|
|
ui(1, progressive_sequence);
|
|
ui(2, chroma_format);
|
|
ui(2, horizontal_size_extension);
|
|
ui(2, vertical_size_extension);
|
|
|
|
mpeg2->horizontal_size = (mpeg2->horizontal_size & 0xfff) |
|
|
current->horizontal_size_extension << 12;
|
|
mpeg2->vertical_size = (mpeg2->vertical_size & 0xfff) |
|
|
current->vertical_size_extension << 12;
|
|
mpeg2->progressive_sequence = current->progressive_sequence;
|
|
|
|
ui(12, bit_rate_extension);
|
|
marker_bit();
|
|
ui(8, vbv_buffer_size_extension);
|
|
ui(1, low_delay);
|
|
ui(2, frame_rate_extension_n);
|
|
ui(5, frame_rate_extension_d);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int FUNC(sequence_display_extension)(CodedBitstreamContext *ctx, RWContext *rw,
|
|
MPEG2RawSequenceDisplayExtension *current)
|
|
{
|
|
int err;
|
|
|
|
HEADER("Sequence Display Extension");
|
|
|
|
ui(3, video_format);
|
|
|
|
ui(1, colour_description);
|
|
if (current->colour_description) {
|
|
ui(8, colour_primaries);
|
|
ui(8, transfer_characteristics);
|
|
ui(8, matrix_coefficients);
|
|
}
|
|
|
|
ui(14, display_horizontal_size);
|
|
marker_bit();
|
|
ui(14, display_vertical_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int FUNC(group_of_pictures_header)(CodedBitstreamContext *ctx, RWContext *rw,
|
|
MPEG2RawGroupOfPicturesHeader *current)
|
|
{
|
|
int err;
|
|
|
|
HEADER("Group of Pictures Header");
|
|
|
|
ui(8, group_start_code);
|
|
|
|
ui(25, time_code);
|
|
ui(1, closed_gop);
|
|
ui(1, broken_link);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int FUNC(picture_header)(CodedBitstreamContext *ctx, RWContext *rw,
|
|
MPEG2RawPictureHeader *current)
|
|
{
|
|
int err;
|
|
|
|
HEADER("Picture Header");
|
|
|
|
ui(8, picture_start_code);
|
|
|
|
ui(10, temporal_reference);
|
|
ui(3, picture_coding_type);
|
|
ui(16, vbv_delay);
|
|
|
|
if (current->picture_coding_type == 2 ||
|
|
current->picture_coding_type == 3) {
|
|
ui(1, full_pel_forward_vector);
|
|
ui(3, forward_f_code);
|
|
}
|
|
|
|
if (current->picture_coding_type == 3) {
|
|
ui(1, full_pel_backward_vector);
|
|
ui(3, backward_f_code);
|
|
}
|
|
|
|
ui(1, extra_bit_picture);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int FUNC(picture_coding_extension)(CodedBitstreamContext *ctx, RWContext *rw,
|
|
MPEG2RawPictureCodingExtension *current)
|
|
{
|
|
CodedBitstreamMPEG2Context *mpeg2 = ctx->priv_data;
|
|
int err;
|
|
|
|
HEADER("Picture Coding Extension");
|
|
|
|
ui(4, f_code[0][0]);
|
|
ui(4, f_code[0][1]);
|
|
ui(4, f_code[1][0]);
|
|
ui(4, f_code[1][1]);
|
|
|
|
ui(2, intra_dc_precision);
|
|
ui(2, picture_structure);
|
|
ui(1, top_field_first);
|
|
ui(1, frame_pred_frame_dct);
|
|
ui(1, concealment_motion_vectors);
|
|
ui(1, q_scale_type);
|
|
ui(1, intra_vlc_format);
|
|
ui(1, alternate_scan);
|
|
ui(1, repeat_first_field);
|
|
ui(1, chroma_420_type);
|
|
ui(1, progressive_frame);
|
|
|
|
if (mpeg2->progressive_sequence) {
|
|
if (current->repeat_first_field) {
|
|
if (current->top_field_first)
|
|
mpeg2->number_of_frame_centre_offsets = 3;
|
|
else
|
|
mpeg2->number_of_frame_centre_offsets = 2;
|
|
} else {
|
|
mpeg2->number_of_frame_centre_offsets = 1;
|
|
}
|
|
} else {
|
|
if (current->picture_structure == 1 || // Top field.
|
|
current->picture_structure == 2) { // Bottom field.
|
|
mpeg2->number_of_frame_centre_offsets = 1;
|
|
} else {
|
|
if (current->repeat_first_field)
|
|
mpeg2->number_of_frame_centre_offsets = 3;
|
|
else
|
|
mpeg2->number_of_frame_centre_offsets = 2;
|
|
}
|
|
}
|
|
|
|
ui(1, composite_display_flag);
|
|
if (current->composite_display_flag) {
|
|
ui(1, v_axis);
|
|
ui(3, field_sequence);
|
|
ui(1, sub_carrier);
|
|
ui(7, burst_amplitude);
|
|
ui(8, sub_carrier_phase);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int FUNC(quant_matrix_extension)(CodedBitstreamContext *ctx, RWContext *rw,
|
|
MPEG2RawQuantMatrixExtension *current)
|
|
{
|
|
int err, i;
|
|
|
|
HEADER("Quant Matrix Extension");
|
|
|
|
ui(1, load_intra_quantiser_matrix);
|
|
if (current->load_intra_quantiser_matrix) {
|
|
for (i = 0; i < 64; i++)
|
|
ui(8, intra_quantiser_matrix[i]);
|
|
}
|
|
|
|
ui(1, load_non_intra_quantiser_matrix);
|
|
if (current->load_non_intra_quantiser_matrix) {
|
|
for (i = 0; i < 64; i++)
|
|
ui(8, non_intra_quantiser_matrix[i]);
|
|
}
|
|
|
|
ui(1, load_chroma_intra_quantiser_matrix);
|
|
if (current->load_chroma_intra_quantiser_matrix) {
|
|
for (i = 0; i < 64; i++)
|
|
ui(8, intra_quantiser_matrix[i]);
|
|
}
|
|
|
|
ui(1, load_chroma_non_intra_quantiser_matrix);
|
|
if (current->load_chroma_non_intra_quantiser_matrix) {
|
|
for (i = 0; i < 64; i++)
|
|
ui(8, chroma_non_intra_quantiser_matrix[i]);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int FUNC(picture_display_extension)(CodedBitstreamContext *ctx, RWContext *rw,
|
|
MPEG2RawPictureDisplayExtension *current)
|
|
{
|
|
CodedBitstreamMPEG2Context *mpeg2 = ctx->priv_data;
|
|
int err, i;
|
|
|
|
HEADER("Picture Display Extension");
|
|
|
|
for (i = 0; i < mpeg2->number_of_frame_centre_offsets; i++) {
|
|
ui(16, frame_centre_horizontal_offset[i]);
|
|
marker_bit();
|
|
ui(16, frame_centre_vertical_offset[i]);
|
|
marker_bit();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int FUNC(extension_data)(CodedBitstreamContext *ctx, RWContext *rw,
|
|
MPEG2RawExtensionData *current)
|
|
{
|
|
int err;
|
|
|
|
HEADER("Extension Data");
|
|
|
|
ui(8, extension_start_code);
|
|
ui(4, extension_start_code_identifier);
|
|
|
|
switch (current->extension_start_code_identifier) {
|
|
case 1:
|
|
return FUNC(sequence_extension)
|
|
(ctx, rw, ¤t->data.sequence);
|
|
case 2:
|
|
return FUNC(sequence_display_extension)
|
|
(ctx, rw, ¤t->data.sequence_display);
|
|
case 3:
|
|
return FUNC(quant_matrix_extension)
|
|
(ctx, rw, ¤t->data.quant_matrix);
|
|
case 7:
|
|
return FUNC(picture_display_extension)
|
|
(ctx, rw, ¤t->data.picture_display);
|
|
case 8:
|
|
return FUNC(picture_coding_extension)
|
|
(ctx, rw, ¤t->data.picture_coding);
|
|
default:
|
|
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid extension ID %d.\n",
|
|
current->extension_start_code_identifier);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
|
|
static int FUNC(slice_header)(CodedBitstreamContext *ctx, RWContext *rw,
|
|
MPEG2RawSliceHeader *current)
|
|
{
|
|
CodedBitstreamMPEG2Context *mpeg2 = ctx->priv_data;
|
|
int err;
|
|
|
|
HEADER("Slice Header");
|
|
|
|
ui(8, slice_vertical_position);
|
|
|
|
if (mpeg2->vertical_size > 2800)
|
|
ui(3, slice_vertical_position_extension);
|
|
if (mpeg2->scalable) {
|
|
if (mpeg2->scalable_mode == 0)
|
|
ui(7, priority_breakpoint);
|
|
}
|
|
|
|
ui(5, quantiser_scale_code);
|
|
|
|
if (nextbits(1, 1, current->slice_extension_flag)) {
|
|
ui(1, slice_extension_flag);
|
|
ui(1, intra_slice);
|
|
ui(1, slice_picture_id_enable);
|
|
ui(6, slice_picture_id);
|
|
|
|
{
|
|
size_t k;
|
|
#ifdef READ
|
|
BitstreamContext start;
|
|
uint8_t bit;
|
|
start = *rw;
|
|
for (k = 0; nextbits(1, 1, bit); k++)
|
|
bitstream_skip(rw, 8);
|
|
current->extra_information_length = k;
|
|
if (k > 0) {
|
|
*rw = start;
|
|
current->extra_information =
|
|
av_malloc(current->extra_information_length);
|
|
if (!current->extra_information)
|
|
return AVERROR(ENOMEM);
|
|
for (k = 0; k < current->extra_information_length; k++) {
|
|
xui(1, extra_bit_slice, bit);
|
|
xui(8, extra_information_slice,
|
|
current->extra_information[k]);
|
|
}
|
|
}
|
|
#else
|
|
for (k = 0; k < current->extra_information_length; k++) {
|
|
xui(1, extra_bit_slice, 1);
|
|
xui(8, extra_information_slice, current->extra_information[k]);
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
ui(1, extra_bit_slice);
|
|
|
|
return 0;
|
|
}
|