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(e)ac3: parse and store the Dolby Surround, Surround EX and Headphone mode flags.
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@ -80,6 +80,30 @@ typedef enum {
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AC3_CHMODE_3F2R
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} AC3ChannelMode;
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/** Dolby Surround mode */
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typedef enum AC3DolbySurroundMode {
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AC3_DSURMOD_NOTINDICATED = 0,
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AC3_DSURMOD_OFF,
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AC3_DSURMOD_ON,
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AC3_DSURMOD_RESERVED
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} AC3DolbySurroundMode;
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/** Dolby Surround EX mode */
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typedef enum AC3DolbySurroundEXMode {
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AC3_DSUREXMOD_NOTINDICATED = 0,
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AC3_DSUREXMOD_OFF,
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AC3_DSUREXMOD_ON,
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AC3_DSUREXMOD_PLIIZ
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} AC3DolbySurroundEXMode;
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/** Dolby Headphone mode */
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typedef enum AC3DolbyHeadphoneMode {
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AC3_DHEADPHONMOD_NOTINDICATED = 0,
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AC3_DHEADPHONMOD_OFF,
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AC3_DHEADPHONMOD_ON,
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AC3_DHEADPHONMOD_RESERVED
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} AC3DolbyHeadphoneMode;
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typedef struct AC3BitAllocParameters {
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int sr_code;
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int sr_shift;
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@ -108,6 +132,7 @@ typedef struct AC3HeaderInfo {
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int surround_mix_level; ///< Surround mix level index
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uint16_t channel_map;
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int num_blocks; ///< number of audio blocks
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int dolby_surround_mode;
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/** @} */
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/** @name Derived values
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@ -68,6 +68,9 @@ int avpriv_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
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hdr->center_mix_level = 5; // -4.5dB
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hdr->surround_mix_level = 6; // -6.0dB
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/* set default dolby surround mode */
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hdr->dolby_surround_mode = AC3_DSURMOD_NOTINDICATED;
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if(hdr->bitstream_id <= 10) {
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/* Normal AC-3 */
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hdr->crc1 = get_bits(gbc, 16);
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@ -85,7 +88,7 @@ int avpriv_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
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hdr->channel_mode = get_bits(gbc, 3);
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if(hdr->channel_mode == AC3_CHMODE_STEREO) {
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skip_bits(gbc, 2); // skip dsurmod
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hdr->dolby_surround_mode = get_bits(gbc, 2);
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} else {
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if((hdr->channel_mode & 1) && hdr->channel_mode != AC3_CHMODE_MONO)
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hdr-> center_mix_level = center_levels[get_bits(gbc, 2)];
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@ -227,12 +227,26 @@ static int ac3_parse_header(AC3DecodeContext *s)
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skip_bits(gbc, 2); //skip copyright bit and original bitstream bit
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/* skip the timecodes (or extra bitstream information for Alternate Syntax)
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/* default dolby matrix encoding modes */
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s->dolby_surround_ex_mode = AC3_DSUREXMOD_NOTINDICATED;
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s->dolby_headphone_mode = AC3_DHEADPHONMOD_NOTINDICATED;
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/* skip the timecodes or parse the Alternate Bit Stream Syntax
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TODO: read & use the xbsi1 downmix levels */
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if (get_bits1(gbc))
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skip_bits(gbc, 14); //skip timecode1 / xbsi1
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if (get_bits1(gbc))
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skip_bits(gbc, 14); //skip timecode2 / xbsi2
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if (s->bitstream_id != 6) {
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if (get_bits1(gbc))
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skip_bits(gbc, 14); //skip timecode1
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if (get_bits1(gbc))
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skip_bits(gbc, 14); //skip timecode2
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} else {
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if (get_bits1(gbc))
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skip_bits(gbc, 14); //skip xbsi1
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if (get_bits1(gbc)) {
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s->dolby_surround_ex_mode = get_bits(gbc, 2);
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s->dolby_headphone_mode = get_bits(gbc, 2);
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skip_bits(gbc, 10); // skip adconvtyp (1), xbsi2 (8), encinfo (1)
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}
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}
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/* skip additional bitstream info */
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if (get_bits1(gbc)) {
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@ -259,6 +273,7 @@ static int parse_frame_header(AC3DecodeContext *s)
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/* get decoding parameters from header info */
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s->bit_alloc_params.sr_code = hdr.sr_code;
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s->bitstream_id = hdr.bitstream_id;
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s->bitstream_mode = hdr.bitstream_mode;
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s->channel_mode = hdr.channel_mode;
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s->lfe_on = hdr.lfe_on;
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@ -274,6 +289,7 @@ static int parse_frame_header(AC3DecodeContext *s)
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s->num_blocks = hdr.num_blocks;
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s->frame_type = hdr.frame_type;
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s->substreamid = hdr.substreamid;
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s->dolby_surround_mode = hdr.dolby_surround_mode;
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if (s->lfe_on) {
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s->start_freq[s->lfe_ch] = 0;
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@ -282,7 +298,7 @@ static int parse_frame_header(AC3DecodeContext *s)
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s->channel_in_cpl[s->lfe_ch] = 0;
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}
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if (hdr.bitstream_id <= 10) {
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if (s->bitstream_id <= 10) {
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s->eac3 = 0;
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s->snr_offset_strategy = 2;
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s->block_switch_syntax = 1;
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@ -79,6 +79,7 @@ typedef struct AC3DecodeContext {
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int bit_rate; ///< stream bit rate, in bits-per-second
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int sample_rate; ///< sample frequency, in Hz
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int num_blocks; ///< number of audio blocks
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int bitstream_id; ///< bitstream id (bsid)
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int bitstream_mode; ///< bitstream mode (bsmod)
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int channel_mode; ///< channel mode (acmod)
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int lfe_on; ///< lfe channel in use
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@ -86,6 +87,9 @@ typedef struct AC3DecodeContext {
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int center_mix_level; ///< Center mix level index
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int surround_mix_level; ///< Surround mix level index
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int eac3; ///< indicates if current frame is E-AC-3
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int dolby_surround_mode; ///< dolby surround mode (dsurmod)
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int dolby_surround_ex_mode; ///< dolby surround ex mode (dsurexmod)
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int dolby_headphone_mode; ///< dolby headphone mode (dheadphonmod)
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///@}
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///@name Frame syntax parameters
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@ -341,6 +341,11 @@ int ff_eac3_parse_header(AC3DecodeContext *s)
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}
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}
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/* default dolby matrix encoding modes */
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s->dolby_surround_mode = AC3_DSURMOD_NOTINDICATED;
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s->dolby_surround_ex_mode = AC3_DSUREXMOD_NOTINDICATED;
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s->dolby_headphone_mode = AC3_DHEADPHONMOD_NOTINDICATED;
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/* mixing metadata */
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if (get_bits1(gbc)) {
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/* center and surround mix levels */
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@ -413,10 +418,11 @@ int ff_eac3_parse_header(AC3DecodeContext *s)
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s->bitstream_mode = get_bits(gbc, 3);
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skip_bits(gbc, 2); // skip copyright bit and original bitstream bit
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if (s->channel_mode == AC3_CHMODE_STEREO) {
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skip_bits(gbc, 4); // skip Dolby surround and headphone mode
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s->dolby_surround_mode = get_bits(gbc, 2);
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s->dolby_headphone_mode = get_bits(gbc, 2);
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}
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if (s->channel_mode >= AC3_CHMODE_2F2R) {
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skip_bits(gbc, 2); // skip Dolby surround EX mode
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s->dolby_surround_ex_mode = get_bits(gbc, 2);
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}
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for (i = 0; i < (s->channel_mode ? 1 : 2); i++) {
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if (get_bits1(gbc)) {
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