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Merge commit '971177f751a6e2931232accceab438bce277bde8'
* commit '971177f751a6e2931232accceab438bce277bde8': dcadec: scan for extensions in a separate function Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>
This commit is contained in:
Hendrik Leppkes
commit
ecaa6cf7b8
@ -1453,6 +1453,114 @@ static float dca_dmix_code(unsigned code)
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return ((ff_dca_dmixtable[code] ^ sign) - sign) * (1.0 / (1 << 15));
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}
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static int scan_for_extensions(AVCodecContext *avctx)
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{
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DCAContext *s = avctx->priv_data;
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int core_ss_end, ret;
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core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;
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/* only scan for extensions if ext_descr was unknown or indicated a
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* supported XCh extension */
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if (s->core_ext_mask < 0 || s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH)) {
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/* if ext_descr was unknown, clear s->core_ext_mask so that the
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* extensions scan can fill it up */
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s->core_ext_mask = FFMAX(s->core_ext_mask, 0);
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/* extensions start at 32-bit boundaries into bitstream */
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skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);
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while (core_ss_end - get_bits_count(&s->gb) >= 32) {
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uint32_t bits = get_bits_long(&s->gb, 32);
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int i;
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switch (bits) {
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case DCA_SYNCWORD_XCH: {
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int ext_amode, xch_fsize;
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s->xch_base_channel = s->prim_channels;
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/* validate sync word using XCHFSIZE field */
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xch_fsize = show_bits(&s->gb, 10);
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if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&
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(s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))
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continue;
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/* skip length-to-end-of-frame field for the moment */
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skip_bits(&s->gb, 10);
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s->core_ext_mask |= DCA_EXT_XCH;
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/* extension amode(number of channels in extension) should be 1 */
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/* AFAIK XCh is not used for more channels */
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if ((ext_amode = get_bits(&s->gb, 4)) != 1) {
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av_log(avctx, AV_LOG_ERROR,
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"XCh extension amode %d not supported!\n",
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ext_amode);
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continue;
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}
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if (s->xch_base_channel < 2) {
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avpriv_request_sample(avctx, "XCh with fewer than 2 base channels");
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continue;
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}
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/* much like core primary audio coding header */
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dca_parse_audio_coding_header(s, s->xch_base_channel, 0);
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for (i = 0; i < (s->sample_blocks / 8); i++)
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if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {
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av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");
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continue;
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}
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s->xch_present = 1;
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break;
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}
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case DCA_SYNCWORD_XXCH:
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/* XXCh: extended channels */
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/* usually found either in core or HD part in DTS-HD HRA streams,
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* but not in DTS-ES which contains XCh extensions instead */
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s->core_ext_mask |= DCA_EXT_XXCH;
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ff_dca_xxch_decode_frame(s);
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break;
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case 0x1d95f262: {
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int fsize96 = show_bits(&s->gb, 12) + 1;
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if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)
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continue;
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av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",
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get_bits_count(&s->gb));
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skip_bits(&s->gb, 12);
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av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);
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av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));
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s->core_ext_mask |= DCA_EXT_X96;
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break;
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}
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}
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skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);
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}
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} else {
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/* no supported extensions, skip the rest of the core substream */
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skip_bits_long(&s->gb, core_ss_end - get_bits_count(&s->gb));
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}
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if (s->core_ext_mask & DCA_EXT_X96)
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s->profile = FF_PROFILE_DTS_96_24;
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else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))
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s->profile = FF_PROFILE_DTS_ES;
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/* check for ExSS (HD part) */
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if (s->dca_buffer_size - s->frame_size > 32 &&
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get_bits_long(&s->gb, 32) == DCA_SYNCWORD_SUBSTREAM)
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ff_dca_exss_parse_header(s);
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return ret;
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}
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/**
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* Main frame decoding function
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* FIXME add arguments
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@ -1472,7 +1580,6 @@ static int dca_decode_frame(AVCodecContext *avctx, void *data,
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float *src_chan;
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float *dst_chan;
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DCAContext *s = avctx->priv_data;
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int core_ss_end;
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int channels, full_channels;
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float scale;
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int achan;
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@ -1564,104 +1671,7 @@ static int dca_decode_frame(AVCodecContext *avctx, void *data,
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else
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s->core_ext_mask = 0;
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core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;
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/* only scan for extensions if ext_descr was unknown or indicated a
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* supported XCh extension */
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if (s->core_ext_mask < 0 || s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH)) {
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/* if ext_descr was unknown, clear s->core_ext_mask so that the
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* extensions scan can fill it up */
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s->core_ext_mask = FFMAX(s->core_ext_mask, 0);
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/* extensions start at 32-bit boundaries into bitstream */
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skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);
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while (core_ss_end - get_bits_count(&s->gb) >= 32) {
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uint32_t bits = get_bits_long(&s->gb, 32);
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switch (bits) {
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case DCA_SYNCWORD_XCH: {
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int ext_amode, xch_fsize;
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s->xch_base_channel = s->prim_channels;
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/* validate sync word using XCHFSIZE field */
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xch_fsize = show_bits(&s->gb, 10);
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if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&
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(s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))
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continue;
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/* skip length-to-end-of-frame field for the moment */
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skip_bits(&s->gb, 10);
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s->core_ext_mask |= DCA_EXT_XCH;
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/* extension amode(number of channels in extension) should be 1 */
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/* AFAIK XCh is not used for more channels */
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if ((ext_amode = get_bits(&s->gb, 4)) != 1) {
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av_log(avctx, AV_LOG_ERROR,
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"XCh extension amode %d not supported!\n",
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ext_amode);
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continue;
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}
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if (s->xch_base_channel < 2) {
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avpriv_request_sample(avctx, "XCh with fewer than 2 base channels");
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continue;
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}
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/* much like core primary audio coding header */
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dca_parse_audio_coding_header(s, s->xch_base_channel, 0);
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for (i = 0; i < (s->sample_blocks / 8); i++)
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if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {
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av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\n");
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continue;
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}
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s->xch_present = 1;
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break;
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}
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case DCA_SYNCWORD_XXCH:
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/* XXCh: extended channels */
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/* usually found either in core or HD part in DTS-HD HRA streams,
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* but not in DTS-ES which contains XCh extensions instead */
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s->core_ext_mask |= DCA_EXT_XXCH;
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ff_dca_xxch_decode_frame(s);
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break;
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case 0x1d95f262: {
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int fsize96 = show_bits(&s->gb, 12) + 1;
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if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)
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continue;
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av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\n",
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get_bits_count(&s->gb));
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skip_bits(&s->gb, 12);
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av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\n", fsize96);
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av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\n", get_bits(&s->gb, 4));
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s->core_ext_mask |= DCA_EXT_X96;
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break;
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}
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}
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skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);
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}
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} else {
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/* no supported extensions, skip the rest of the core substream */
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skip_bits_long(&s->gb, core_ss_end - get_bits_count(&s->gb));
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}
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if (s->core_ext_mask & DCA_EXT_X96)
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s->profile = FF_PROFILE_DTS_96_24;
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else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))
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s->profile = FF_PROFILE_DTS_ES;
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/* check for ExSS (HD part) */
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if (s->dca_buffer_size - s->frame_size > 32 &&
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get_bits_long(&s->gb, 32) == DCA_SYNCWORD_SUBSTREAM)
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ff_dca_exss_parse_header(s);
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ret = scan_for_extensions(avctx);
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avctx->profile = s->profile;
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