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aacdec: Reshuffle functions so get_che() can call set_default_channel_config() and output_configure().
This commit is contained in:
Alex Converse
@@ -114,55 +114,6 @@ static VLC vlc_spectral[11];
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static const char overread_err[] = "Input buffer exhausted before END element found\n";
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static const char overread_err[] = "Input buffer exhausted before END element found\n";
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static ChannelElement *get_che(AACContext *ac, int type, int elem_id)
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{
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// For PCE based channel configurations map the channels solely based on tags.
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if (!ac->m4ac.chan_config) {
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return ac->tag_che_map[type][elem_id];
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}
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// For indexed channel configurations map the channels solely based on position.
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switch (ac->m4ac.chan_config) {
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case 7:
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if (ac->tags_mapped == 3 && type == TYPE_CPE) {
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ac->tags_mapped++;
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return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][2];
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}
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case 6:
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/* Some streams incorrectly code 5.1 audio as SCE[0] CPE[0] CPE[1] SCE[1]
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instead of SCE[0] CPE[0] CPE[1] LFE[0]. If we seem to have
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encountered such a stream, transfer the LFE[0] element to the SCE[1]'s mapping */
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if (ac->tags_mapped == tags_per_config[ac->m4ac.chan_config] - 1 && (type == TYPE_LFE || type == TYPE_SCE)) {
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ac->tags_mapped++;
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return ac->tag_che_map[type][elem_id] = ac->che[TYPE_LFE][0];
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}
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case 5:
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if (ac->tags_mapped == 2 && type == TYPE_CPE) {
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ac->tags_mapped++;
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return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][1];
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}
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case 4:
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if (ac->tags_mapped == 2 && ac->m4ac.chan_config == 4 && type == TYPE_SCE) {
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ac->tags_mapped++;
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return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][1];
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}
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case 3:
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case 2:
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if (ac->tags_mapped == (ac->m4ac.chan_config != 2) && type == TYPE_CPE) {
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ac->tags_mapped++;
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return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][0];
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} else if (ac->m4ac.chan_config == 2) {
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return NULL;
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}
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case 1:
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if (!ac->tags_mapped && type == TYPE_SCE) {
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ac->tags_mapped++;
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return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][0];
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}
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default:
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return NULL;
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}
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}
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static int count_channels(uint8_t (*layout)[3], int tags)
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static int count_channels(uint8_t (*layout)[3], int tags)
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{
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{
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int i, sum = 0;
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int i, sum = 0;
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@@ -437,6 +388,76 @@ static av_cold int output_configure(AACContext *ac,
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return 0;
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return 0;
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}
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}
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/**
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* Set up channel positions based on a default channel configuration
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* as specified in table 1.17.
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*
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* @return Returns error status. 0 - OK, !0 - error
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*/
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static av_cold int set_default_channel_config(AVCodecContext *avctx,
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uint8_t (*layout_map)[3],
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int *tags,
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int channel_config)
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{
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if (channel_config < 1 || channel_config > 7) {
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av_log(avctx, AV_LOG_ERROR, "invalid default channel configuration (%d)\n",
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channel_config);
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return -1;
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}
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*tags = tags_per_config[channel_config];
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memcpy(layout_map, aac_channel_layout_map[channel_config-1], *tags * sizeof(*layout_map));
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return 0;
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}
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static ChannelElement *get_che(AACContext *ac, int type, int elem_id)
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{
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// For PCE based channel configurations map the channels solely based on tags.
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if (!ac->m4ac.chan_config) {
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return ac->tag_che_map[type][elem_id];
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}
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// For indexed channel configurations map the channels solely based on position.
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switch (ac->m4ac.chan_config) {
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case 7:
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if (ac->tags_mapped == 3 && type == TYPE_CPE) {
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ac->tags_mapped++;
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return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][2];
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}
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case 6:
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/* Some streams incorrectly code 5.1 audio as SCE[0] CPE[0] CPE[1] SCE[1]
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instead of SCE[0] CPE[0] CPE[1] LFE[0]. If we seem to have
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encountered such a stream, transfer the LFE[0] element to the SCE[1]'s mapping */
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if (ac->tags_mapped == tags_per_config[ac->m4ac.chan_config] - 1 && (type == TYPE_LFE || type == TYPE_SCE)) {
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ac->tags_mapped++;
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return ac->tag_che_map[type][elem_id] = ac->che[TYPE_LFE][0];
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}
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case 5:
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if (ac->tags_mapped == 2 && type == TYPE_CPE) {
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ac->tags_mapped++;
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return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][1];
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}
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case 4:
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if (ac->tags_mapped == 2 && ac->m4ac.chan_config == 4 && type == TYPE_SCE) {
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ac->tags_mapped++;
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return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][1];
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}
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case 3:
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case 2:
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if (ac->tags_mapped == (ac->m4ac.chan_config != 2) && type == TYPE_CPE) {
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ac->tags_mapped++;
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return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][0];
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} else if (ac->m4ac.chan_config == 2) {
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return NULL;
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}
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case 1:
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if (!ac->tags_mapped && type == TYPE_SCE) {
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ac->tags_mapped++;
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return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][0];
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}
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default:
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return NULL;
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}
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}
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/**
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/**
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* Decode an array of 4 bit element IDs, optionally interleaved with a stereo/mono switching bit.
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* Decode an array of 4 bit element IDs, optionally interleaved with a stereo/mono switching bit.
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*
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*
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@@ -529,27 +550,6 @@ static int decode_pce(AVCodecContext *avctx, MPEG4AudioConfig *m4ac,
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return tags;
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return tags;
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}
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}
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/**
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* Set up channel positions based on a default channel configuration
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* as specified in table 1.17.
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*
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* @return Returns error status. 0 - OK, !0 - error
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*/
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static av_cold int set_default_channel_config(AVCodecContext *avctx,
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uint8_t (*layout_map)[3],
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int *tags,
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int channel_config)
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{
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if (channel_config < 1 || channel_config > 7) {
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av_log(avctx, AV_LOG_ERROR, "invalid default channel configuration (%d)\n",
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channel_config);
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return -1;
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}
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*tags = tags_per_config[channel_config];
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memcpy(layout_map, aac_channel_layout_map[channel_config-1], *tags * sizeof(*layout_map));
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return 0;
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}
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/**
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/**
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* Decode GA "General Audio" specific configuration; reference: table 4.1.
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* Decode GA "General Audio" specific configuration; reference: table 4.1.
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*
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*
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