mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-12 19:18:44 +02:00
9c3f2a8894
MPEG-2 contains several elements that mustn't be zero according to the specifications: horizontal/vertical_size_value, aspect_ratio_information, frame_rate_code, the quantiser matrices, the colour_description elements, picture_coding_type, the f_code[r][s] values and quantiser_scale_code. It is now checked that the invalid values don't occur. The colour_description elements are treated specially in this regard: Given that there are files in the wild which use illegal values for the colour_description elements (some of them created by mpeg2_metadata), they will be corrected to the value meaning "unknown" (namely 2) during reading. This has been done in such a way that trace_headers will nevertheless report the original value, together with a message about the fixup. Furthermore, the trace_headers output of user_data has been beautified. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
403 lines
12 KiB
C
403 lines
12 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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static int FUNC(sequence_header)(CodedBitstreamContext *ctx, RWContext *rw,
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MPEG2RawSequenceHeader *current)
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{
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CodedBitstreamMPEG2Context *mpeg2 = ctx->priv_data;
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int err, i;
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HEADER("Sequence Header");
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ui(8, sequence_header_code);
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uir(12, horizontal_size_value);
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uir(12, vertical_size_value);
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mpeg2->horizontal_size = current->horizontal_size_value;
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mpeg2->vertical_size = current->vertical_size_value;
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uir(4, aspect_ratio_information);
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uir(4, frame_rate_code);
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ui(18, bit_rate_value);
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marker_bit();
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ui(10, vbv_buffer_size_value);
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ui(1, constrained_parameters_flag);
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ui(1, load_intra_quantiser_matrix);
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if (current->load_intra_quantiser_matrix) {
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for (i = 0; i < 64; i++)
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uirs(8, intra_quantiser_matrix[i], 1, i);
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}
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ui(1, load_non_intra_quantiser_matrix);
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if (current->load_non_intra_quantiser_matrix) {
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for (i = 0; i < 64; i++)
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uirs(8, non_intra_quantiser_matrix[i], 1, i);
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}
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return 0;
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}
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static int FUNC(user_data)(CodedBitstreamContext *ctx, RWContext *rw,
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MPEG2RawUserData *current)
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{
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size_t k;
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int err;
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HEADER("User Data");
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ui(8, user_data_start_code);
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#ifdef READ
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k = get_bits_left(rw);
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av_assert0(k % 8 == 0);
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current->user_data_length = k /= 8;
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if (k > 0) {
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current->user_data_ref = av_buffer_allocz(k + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!current->user_data_ref)
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return AVERROR(ENOMEM);
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current->user_data = current->user_data_ref->data;
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}
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#endif
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for (k = 0; k < current->user_data_length; k++)
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uis(8, user_data[k], 1, k);
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return 0;
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}
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static int FUNC(sequence_extension)(CodedBitstreamContext *ctx, RWContext *rw,
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MPEG2RawSequenceExtension *current)
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{
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CodedBitstreamMPEG2Context *mpeg2 = ctx->priv_data;
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int err;
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HEADER("Sequence Extension");
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ui(8, profile_and_level_indication);
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ui(1, progressive_sequence);
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ui(2, chroma_format);
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ui(2, horizontal_size_extension);
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ui(2, vertical_size_extension);
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mpeg2->horizontal_size = (mpeg2->horizontal_size & 0xfff) |
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current->horizontal_size_extension << 12;
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mpeg2->vertical_size = (mpeg2->vertical_size & 0xfff) |
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current->vertical_size_extension << 12;
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mpeg2->progressive_sequence = current->progressive_sequence;
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ui(12, bit_rate_extension);
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marker_bit();
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ui(8, vbv_buffer_size_extension);
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ui(1, low_delay);
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ui(2, frame_rate_extension_n);
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ui(5, frame_rate_extension_d);
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return 0;
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}
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static int FUNC(sequence_display_extension)(CodedBitstreamContext *ctx, RWContext *rw,
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MPEG2RawSequenceDisplayExtension *current)
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{
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int err;
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HEADER("Sequence Display Extension");
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ui(3, video_format);
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ui(1, colour_description);
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if (current->colour_description) {
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#ifdef READ
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#define READ_AND_PATCH(name) do { \
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ui(8, name); \
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if (current->name == 0) { \
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current->name = 2; \
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av_log(ctx->log_ctx, AV_LOG_WARNING, "%s in a sequence display " \
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"extension had the invalid value 0. Setting it to 2 " \
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"(meaning unknown) instead.\n", #name); \
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} \
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} while (0)
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READ_AND_PATCH(colour_primaries);
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READ_AND_PATCH(transfer_characteristics);
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READ_AND_PATCH(matrix_coefficients);
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#undef READ_AND_PATCH
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#else
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uir(8, colour_primaries);
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uir(8, transfer_characteristics);
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uir(8, matrix_coefficients);
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#endif
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}
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ui(14, display_horizontal_size);
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marker_bit();
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ui(14, display_vertical_size);
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return 0;
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}
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static int FUNC(group_of_pictures_header)(CodedBitstreamContext *ctx, RWContext *rw,
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MPEG2RawGroupOfPicturesHeader *current)
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{
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int err;
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HEADER("Group of Pictures Header");
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ui(8, group_start_code);
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ui(25, time_code);
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ui(1, closed_gop);
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ui(1, broken_link);
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return 0;
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}
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static int FUNC(picture_header)(CodedBitstreamContext *ctx, RWContext *rw,
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MPEG2RawPictureHeader *current)
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{
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int err;
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HEADER("Picture Header");
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ui(8, picture_start_code);
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ui(10, temporal_reference);
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uir(3, picture_coding_type);
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ui(16, vbv_delay);
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if (current->picture_coding_type == 2 ||
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current->picture_coding_type == 3) {
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ui(1, full_pel_forward_vector);
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ui(3, forward_f_code);
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}
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if (current->picture_coding_type == 3) {
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ui(1, full_pel_backward_vector);
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ui(3, backward_f_code);
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}
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ui(1, extra_bit_picture);
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return 0;
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}
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static int FUNC(picture_coding_extension)(CodedBitstreamContext *ctx, RWContext *rw,
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MPEG2RawPictureCodingExtension *current)
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{
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CodedBitstreamMPEG2Context *mpeg2 = ctx->priv_data;
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int err;
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HEADER("Picture Coding Extension");
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uir(4, f_code[0][0]);
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uir(4, f_code[0][1]);
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uir(4, f_code[1][0]);
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uir(4, f_code[1][1]);
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ui(2, intra_dc_precision);
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ui(2, picture_structure);
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ui(1, top_field_first);
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ui(1, frame_pred_frame_dct);
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ui(1, concealment_motion_vectors);
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ui(1, q_scale_type);
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ui(1, intra_vlc_format);
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ui(1, alternate_scan);
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ui(1, repeat_first_field);
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ui(1, chroma_420_type);
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ui(1, progressive_frame);
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if (mpeg2->progressive_sequence) {
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if (current->repeat_first_field) {
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if (current->top_field_first)
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mpeg2->number_of_frame_centre_offsets = 3;
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else
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mpeg2->number_of_frame_centre_offsets = 2;
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} else {
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mpeg2->number_of_frame_centre_offsets = 1;
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}
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} else {
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if (current->picture_structure == 1 || // Top field.
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current->picture_structure == 2) { // Bottom field.
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mpeg2->number_of_frame_centre_offsets = 1;
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} else {
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if (current->repeat_first_field)
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mpeg2->number_of_frame_centre_offsets = 3;
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else
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mpeg2->number_of_frame_centre_offsets = 2;
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}
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}
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ui(1, composite_display_flag);
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if (current->composite_display_flag) {
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ui(1, v_axis);
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ui(3, field_sequence);
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ui(1, sub_carrier);
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ui(7, burst_amplitude);
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ui(8, sub_carrier_phase);
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}
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return 0;
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}
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static int FUNC(quant_matrix_extension)(CodedBitstreamContext *ctx, RWContext *rw,
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MPEG2RawQuantMatrixExtension *current)
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{
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int err, i;
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HEADER("Quant Matrix Extension");
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ui(1, load_intra_quantiser_matrix);
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if (current->load_intra_quantiser_matrix) {
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for (i = 0; i < 64; i++)
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uirs(8, intra_quantiser_matrix[i], 1, i);
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}
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ui(1, load_non_intra_quantiser_matrix);
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if (current->load_non_intra_quantiser_matrix) {
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for (i = 0; i < 64; i++)
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uirs(8, non_intra_quantiser_matrix[i], 1, i);
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}
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ui(1, load_chroma_intra_quantiser_matrix);
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if (current->load_chroma_intra_quantiser_matrix) {
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for (i = 0; i < 64; i++)
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uirs(8, intra_quantiser_matrix[i], 1, i);
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}
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ui(1, load_chroma_non_intra_quantiser_matrix);
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if (current->load_chroma_non_intra_quantiser_matrix) {
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for (i = 0; i < 64; i++)
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uirs(8, chroma_non_intra_quantiser_matrix[i], 1, i);
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}
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return 0;
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}
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static int FUNC(picture_display_extension)(CodedBitstreamContext *ctx, RWContext *rw,
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MPEG2RawPictureDisplayExtension *current)
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{
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CodedBitstreamMPEG2Context *mpeg2 = ctx->priv_data;
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int err, i;
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HEADER("Picture Display Extension");
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for (i = 0; i < mpeg2->number_of_frame_centre_offsets; i++) {
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ui(16, frame_centre_horizontal_offset[i]);
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marker_bit();
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ui(16, frame_centre_vertical_offset[i]);
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marker_bit();
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}
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return 0;
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}
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static int FUNC(extension_data)(CodedBitstreamContext *ctx, RWContext *rw,
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MPEG2RawExtensionData *current)
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{
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int err;
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HEADER("Extension Data");
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ui(8, extension_start_code);
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ui(4, extension_start_code_identifier);
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switch (current->extension_start_code_identifier) {
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case MPEG2_EXTENSION_SEQUENCE:
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return FUNC(sequence_extension)
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(ctx, rw, ¤t->data.sequence);
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case MPEG2_EXTENSION_SEQUENCE_DISPLAY:
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return FUNC(sequence_display_extension)
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(ctx, rw, ¤t->data.sequence_display);
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case MPEG2_EXTENSION_QUANT_MATRIX:
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return FUNC(quant_matrix_extension)
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(ctx, rw, ¤t->data.quant_matrix);
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case MPEG2_EXTENSION_PICTURE_DISPLAY:
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return FUNC(picture_display_extension)
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(ctx, rw, ¤t->data.picture_display);
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case MPEG2_EXTENSION_PICTURE_CODING:
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return FUNC(picture_coding_extension)
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(ctx, rw, ¤t->data.picture_coding);
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default:
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av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid extension ID %d.\n",
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current->extension_start_code_identifier);
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return AVERROR_INVALIDDATA;
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}
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}
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static int FUNC(slice_header)(CodedBitstreamContext *ctx, RWContext *rw,
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MPEG2RawSliceHeader *current)
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{
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CodedBitstreamMPEG2Context *mpeg2 = ctx->priv_data;
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int err;
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HEADER("Slice Header");
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ui(8, slice_vertical_position);
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if (mpeg2->vertical_size > 2800)
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ui(3, slice_vertical_position_extension);
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if (mpeg2->scalable) {
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if (mpeg2->scalable_mode == 0)
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ui(7, priority_breakpoint);
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}
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uir(5, quantiser_scale_code);
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if (nextbits(1, 1, current->slice_extension_flag)) {
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ui(1, slice_extension_flag);
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ui(1, intra_slice);
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ui(1, slice_picture_id_enable);
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ui(6, slice_picture_id);
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{
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size_t k;
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#ifdef READ
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GetBitContext start;
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uint8_t bit;
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start = *rw;
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for (k = 0; nextbits(1, 1, bit); k++)
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skip_bits(rw, 8);
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current->extra_information_length = k;
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if (k > 0) {
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*rw = start;
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current->extra_information =
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av_malloc(current->extra_information_length);
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if (!current->extra_information)
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return AVERROR(ENOMEM);
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for (k = 0; k < current->extra_information_length; k++) {
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xui(1, extra_bit_slice, bit, 1, 1, 0);
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xui(8, extra_information_slice[k],
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current->extra_information[k], 0, 255, 1, k);
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}
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}
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#else
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for (k = 0; k < current->extra_information_length; k++) {
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xui(1, extra_bit_slice, 1, 1, 1, 0);
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xui(8, extra_information_slice[k],
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current->extra_information[k], 0, 255, 1, k);
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}
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#endif
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}
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}
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ui(1, extra_bit_slice);
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return 0;
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}
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