From d08d7142fd279cf30f35bdef9b982ea47d65c535 Mon Sep 17 00:00:00 2001 From: Mike Melanson Date: Tue, 28 Sep 2004 03:09:49 +0000 Subject: support for Sierra Online audio files and Apple QuickDraw codec, courtesy of Konstantin Shishkov Originally committed as revision 3529 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/dpcm.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) (limited to 'libavcodec/dpcm.c') diff --git a/libavcodec/dpcm.c b/libavcodec/dpcm.c index b80604e5f4..78ab8cb34f 100644 --- a/libavcodec/dpcm.c +++ b/libavcodec/dpcm.c @@ -24,6 +24,7 @@ * Xan DPCM decoder by Mario Brito (mbrito@student.dei.uc.pt) * for more information on the specific data formats, visit: * http://www.pcisys.net/~melanson/codecs/simpleaudio.html + * SOL DPCMs implemented by Konstantin Shishkov * * Note about using the Xan DPCM decoder: Xan DPCM is used in AVI files * found in the Wing Commander IV computer game. These AVI files contain @@ -39,6 +40,8 @@ typedef struct DPCMContext { int channels; short roq_square_array[256]; + long sample[2];//for SOL_DPCM + int *sol_table;//for SOL_DPCM } DPCMContext; #define SATURATE_S16(x) if (x < -32768) x = -32768; \ @@ -81,6 +84,32 @@ static int interplay_delta_table[] = { }; +static int sol_table_old[16] = + { 0x0, 0x1, 0x2 , 0x3, 0x6, 0xA, 0xF, 0x15, + -0x15, -0xF, -0xA, -0x6, -0x3, -0x2, -0x1, 0x0}; + +static int sol_table_new[16] = + { 0x0, 0x1, 0x2, 0x3, 0x6, 0xA, 0xF, 0x15, + 0x0, -0x1, -0x2, -0x3, -0x6, -0xA, -0xF, -0x15}; + +static int sol_table_16[128] = { + 0x000, 0x008, 0x010, 0x020, 0x030, 0x040, 0x050, 0x060, 0x070, 0x080, + 0x090, 0x0A0, 0x0B0, 0x0C0, 0x0D0, 0x0E0, 0x0F0, 0x100, 0x110, 0x120, + 0x130, 0x140, 0x150, 0x160, 0x170, 0x180, 0x190, 0x1A0, 0x1B0, 0x1C0, + 0x1D0, 0x1E0, 0x1F0, 0x200, 0x208, 0x210, 0x218, 0x220, 0x228, 0x230, + 0x238, 0x240, 0x248, 0x250, 0x258, 0x260, 0x268, 0x270, 0x278, 0x280, + 0x288, 0x290, 0x298, 0x2A0, 0x2A8, 0x2B0, 0x2B8, 0x2C0, 0x2C8, 0x2D0, + 0x2D8, 0x2E0, 0x2E8, 0x2F0, 0x2F8, 0x300, 0x308, 0x310, 0x318, 0x320, + 0x328, 0x330, 0x338, 0x340, 0x348, 0x350, 0x358, 0x360, 0x368, 0x370, + 0x378, 0x380, 0x388, 0x390, 0x398, 0x3A0, 0x3A8, 0x3B0, 0x3B8, 0x3C0, + 0x3C8, 0x3D0, 0x3D8, 0x3E0, 0x3E8, 0x3F0, 0x3F8, 0x400, 0x440, 0x480, + 0x4C0, 0x500, 0x540, 0x580, 0x5C0, 0x600, 0x640, 0x680, 0x6C0, 0x700, + 0x740, 0x780, 0x7C0, 0x800, 0x900, 0xA00, 0xB00, 0xC00, 0xD00, 0xE00, + 0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000 +}; + + + static int dpcm_decode_init(AVCodecContext *avctx) { DPCMContext *s = avctx->priv_data; @@ -88,6 +117,7 @@ static int dpcm_decode_init(AVCodecContext *avctx) short square; s->channels = avctx->channels; + s->sample[0] = s->sample[1] = 0; switch(avctx->codec->id) { @@ -100,6 +130,26 @@ static int dpcm_decode_init(AVCodecContext *avctx) } break; + + case CODEC_ID_SOL_DPCM: + switch(avctx->codec_tag){ + case 1: + s->sol_table=sol_table_old; + s->sample[0] = s->sample[1] = 0x80; + break; + case 2: + s->sol_table=sol_table_new; + s->sample[0] = s->sample[1] = 0x80; + break; + case 3: + s->sol_table=sol_table_16; + break; + default: + av_log(avctx, AV_LOG_ERROR, "Unknown SOL subcodec\n"); + return -1; + } + break; + default: break; } @@ -203,6 +253,35 @@ static int dpcm_decode_frame(AVCodecContext *avctx, channel_number ^= s->channels - 1; } break; + case CODEC_ID_SOL_DPCM: + in = 0; + if (avctx->codec_tag != 3) { + while (in < buf_size) { + int n1, n2; + n1 = (buf[in] >> 4) & 0xF; + n2 = buf[in++] & 0xF; + s->sample[0] += s->sol_table[n1]; + if (s->sample[0] < 0) s->sample[0] = 0; + if (s->sample[0] > 255) s->sample[0] = 255; + output_samples[out++] = (s->sample[0] - 128) << 8; + s->sample[s->channels - 1] += s->sol_table[n2]; + if (s->sample[s->channels - 1] < 0) s->sample[s->channels - 1] = 0; + if (s->sample[s->channels - 1] > 255) s->sample[s->channels - 1] = 255; + output_samples[out++] = (s->sample[s->channels - 1] - 128) << 8; + } + } else { + while (in < buf_size) { + int n; + n = buf[in++]; + if (n & 0x80) s->sample[channel_number] -= s->sol_table[n & 0x7F]; + else s->sample[channel_number] += s->sol_table[n & 0x7F]; + SATURATE_S16(s->sample[channel_number]); + output_samples[out++] = s->sample[channel_number]; + /* toggle channel */ + channel_number ^= s->channels - 1; + } + } + break; } *data_size = out * sizeof(short); @@ -241,3 +320,14 @@ AVCodec xan_dpcm_decoder = { NULL, dpcm_decode_frame, }; + +AVCodec sol_dpcm_decoder = { + "sol_dpcm", + CODEC_TYPE_AUDIO, + CODEC_ID_SOL_DPCM, + sizeof(DPCMContext), + dpcm_decode_init, + NULL, + NULL, + dpcm_decode_frame, +}; -- cgit v1.2.3