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71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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#include "../coding/acm_decoder_libacm.h"
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/* ACM - InterPlay infinity engine games [Planescape: Torment (PC), Baldur's Gate (PC)] */
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VGMSTREAM* init_vgmstream_acm(STREAMFILE* sf) {
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VGMSTREAM * vgmstream = NULL;
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int loop_flag = 0, channels, sample_rate, num_samples;
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int force_channel_number = 0;
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acm_codec_data *data = NULL;
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/* checks */
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/* .acm: plain ACM extension (often but not always paired with .mus, parsed elsewhere)
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* .tun: Descent to Undermountain (PC)
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* .wavc: header id for WAVC sfx (from bigfiles, extensionless) */
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if (!check_extensions(sf, "acm,tun,wavc"))
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goto fail;
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if (read_u32be(0x00,sf) != 0x97280301 && /* header id (music) */
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!is_id32be(0x00,sf, "WAVC")) /* sfx */
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goto fail;
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/* Plain ACM "channels" in the header (at 0x08) may be set to 2 for mono voices [FO1] or 1 for music [P:T],
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* but actually seem related to ACM rows/cols and have nothing to do with channels.
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*
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* libacm will set plain ACM (not WAVC) to 2ch unless changed, but only Fallout (PC)
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* and Descent to Undermountain (PC) seems to use plain ACM for sfx/voices,
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* others are WAVC (which do have channels).
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* DtU seems to use the field
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*
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* Doesn't look like there is any way to detect mono/stereo, so as a quick hack if
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* we have a plain ACM (not WAVC) named .wavc we will force 1ch. */
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if (check_extensions(sf, "wavc") && read_u32be(0x00,sf) == 0x97280301) {
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force_channel_number = 1;
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}
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/* init decoder */
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{
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ACMStream *handle;
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data = init_acm(sf, force_channel_number);
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if (!data) goto fail;
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handle = data->handle;
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channels = handle->info.channels;
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sample_rate = handle->info.rate;
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num_samples = handle->total_values / handle->info.channels;
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}
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channels, loop_flag);
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if (!vgmstream) goto fail;
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vgmstream->sample_rate = sample_rate;
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vgmstream->num_samples = num_samples;
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vgmstream->meta_type = meta_ACM;
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vgmstream->coding_type = coding_ACM;
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vgmstream->layout_type = layout_none;
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vgmstream->codec_data = data;
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return vgmstream;
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fail:
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free_acm(data);
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close_vgmstream(vgmstream);
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return NULL;
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}
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