lavf/srtdec: simplify start/end computation.
[ffmpeg.git] / libavformat / swfdec.c
index d899b2d..b8c2e93 100644 (file)
@@ -1,7 +1,7 @@
 /*
  * Flash Compatible Streaming Format demuxer
- * Copyright (c) 2000 Fabrice Bellard.
- * Copyright (c) 2003 Tinic Uro.
+ * Copyright (c) 2000 Fabrice Bellard
+ * Copyright (c) 2003 Tinic Uro
  *
  * This file is part of FFmpeg.
  *
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/avassert.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/intreadwrite.h"
 #include "swf.h"
 
-static int get_swf_tag(ByteIOContext *pb, int *len_ptr)
+static const AVCodecTag swf_audio_codec_tags[] = {
+    { AV_CODEC_ID_PCM_S16LE,  0x00 },
+    { AV_CODEC_ID_ADPCM_SWF,  0x01 },
+    { AV_CODEC_ID_MP3,        0x02 },
+    { AV_CODEC_ID_PCM_S16LE,  0x03 },
+//  { AV_CODEC_ID_NELLYMOSER, 0x06 },
+    { AV_CODEC_ID_NONE,          0 },
+};
+
+static int get_swf_tag(AVIOContext *pb, int *len_ptr)
 {
     int tag, len;
 
     if (url_feof(pb))
-        return -1;
+        return AVERROR_EOF;
 
-    tag = get_le16(pb);
+    tag = avio_rl16(pb);
     len = tag & 0x3f;
     tag = tag >> 6;
     if (len == 0x3f) {
-        len = get_le32(pb);
+        len = avio_rl32(pb);
     }
-//    av_log(NULL, AV_LOG_DEBUG, "Tag: %d - Len: %d\n", tag, len);
     *len_ptr = len;
     return tag;
 }
@@ -51,27 +62,75 @@ static int swf_probe(AVProbeData *p)
         return 0;
 }
 
-static int swf_read_header(AVFormatContext *s, AVFormatParameters *ap)
+#if CONFIG_ZLIB
+static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
+{
+    AVFormatContext *s = opaque;
+    SWFContext *swf = s->priv_data;
+    z_stream *z = &swf->zstream;
+    int ret;
+
+retry:
+    if (!z->avail_in) {
+        int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
+        if (n < 0)
+            return n;
+        z->next_in  = swf->zbuf_in;
+        z->avail_in = n;
+    }
+
+    z->next_out  = buf;
+    z->avail_out = buf_size;
+
+    ret = inflate(z, Z_NO_FLUSH);
+    if (ret < 0)
+        return AVERROR(EINVAL);
+    if (ret == Z_STREAM_END)
+        return AVERROR_EOF;
+
+    if (buf_size - z->avail_out == 0)
+        goto retry;
+
+    return buf_size - z->avail_out;
+}
+#endif
+
+static int swf_read_header(AVFormatContext *s)
 {
     SWFContext *swf = s->priv_data;
-    ByteIOContext *pb = s->pb;
+    AVIOContext *pb = s->pb;
     int nbits, len, tag;
 
-    tag = get_be32(pb) & 0xffffff00;
+    tag = avio_rb32(pb) & 0xffffff00;
+    avio_rl32(pb);
 
     if (tag == MKBETAG('C', 'W', 'S', 0)) {
-        av_log(s, AV_LOG_ERROR, "Compressed SWF format not supported\n");
+        av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
+#if CONFIG_ZLIB
+        swf->zbuf_in  = av_malloc(ZBUF_SIZE);
+        swf->zbuf_out = av_malloc(ZBUF_SIZE);
+        swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s,
+                                      zlib_refill, NULL, NULL);
+        if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb)
+            return AVERROR(ENOMEM);
+        swf->zpb->seekable = 0;
+        if (inflateInit(&swf->zstream) != Z_OK) {
+            av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
+            return AVERROR(EINVAL);
+        }
+        pb = swf->zpb;
+#else
+        av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
         return AVERROR(EIO);
-    }
-    if (tag != MKBETAG('F', 'W', 'S', 0))
+#endif
+    } else if (tag != MKBETAG('F', 'W', 'S', 0))
         return AVERROR(EIO);
-    get_le32(pb);
     /* skip rectangle size */
-    nbits = get_byte(pb) >> 3;
+    nbits = avio_r8(pb) >> 3;
     len = (4 * nbits - 3 + 7) / 8;
-    url_fskip(pb, len);
-    swf->frame_rate = get_le16(pb); /* 8.8 fixed */
-    get_le16(pb); /* frame count */
+    avio_skip(pb, len);
+    swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
+    avio_rl16(pb); /* frame count */
 
     swf->samples_per_frame = 0;
     s->ctx_flags |= AVFMTCTX_NOHEADER;
@@ -81,113 +140,317 @@ static int swf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     SWFContext *swf = s->priv_data;
-    ByteIOContext *pb = s->pb;
+    AVIOContext *pb = s->pb;
     AVStream *vst = NULL, *ast = NULL, *st = 0;
-    int tag, len, i, frame, v;
+    int tag, len, i, frame, v, res;
+
+#if CONFIG_ZLIB
+    if (swf->zpb)
+        pb = swf->zpb;
+#endif
 
     for(;;) {
+        uint64_t pos = avio_tell(pb);
         tag = get_swf_tag(pb, &len);
         if (tag < 0)
-            return AVERROR(EIO);
-        if (tag == TAG_VIDEOSTREAM && !vst) {
-            int ch_id = get_le16(pb);
-            get_le16(pb);
-            get_le16(pb);
-            get_le16(pb);
-            get_byte(pb);
+            return tag;
+        if (tag == TAG_VIDEOSTREAM) {
+            int ch_id = avio_rl16(pb);
+            len -= 2;
+
+            for (i=0; i<s->nb_streams; i++) {
+                st = s->streams[i];
+                if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
+                    goto skip;
+            }
+
+            avio_rl16(pb);
+            avio_rl16(pb);
+            avio_rl16(pb);
+            avio_r8(pb);
             /* Check for FLV1 */
-            vst = av_new_stream(s, ch_id);
+            vst = avformat_new_stream(s, NULL);
             if (!vst)
-                return -1;
-            vst->codec->codec_type = CODEC_TYPE_VIDEO;
-            vst->codec->codec_id = codec_get_id(swf_codec_tags, get_byte(pb));
-            av_set_pts_info(vst, 64, 256, swf->frame_rate);
-            vst->codec->time_base = (AVRational){ 256, swf->frame_rate };
-            len -= 10;
-        } else if ((tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) && !ast) {
+                return AVERROR(ENOMEM);
+            vst->id = ch_id;
+            vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+            vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
+            avpriv_set_pts_info(vst, 16, 256, swf->frame_rate);
+            len -= 8;
+        } else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
             /* streaming found */
             int sample_rate_code;
-            get_byte(pb);
-            v = get_byte(pb);
-            swf->samples_per_frame = get_le16(pb);
-            ast = av_new_stream(s, -1); /* -1 to avoid clash with video stream ch_id */
+
+            for (i=0; i<s->nb_streams; i++) {
+                st = s->streams[i];
+                if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
+                    goto skip;
+            }
+
+            avio_r8(pb);
+            v = avio_r8(pb);
+            swf->samples_per_frame = avio_rl16(pb);
+            ast = avformat_new_stream(s, NULL);
             if (!ast)
-                return -1;
-            swf->audio_stream_index = ast->index;
+                return AVERROR(ENOMEM);
+            ast->id = -1; /* -1 to avoid clash with video stream ch_id */
             ast->codec->channels = 1 + (v&1);
-            ast->codec->codec_type = CODEC_TYPE_AUDIO;
-            ast->codec->codec_id = codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
+            ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+            ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
             ast->need_parsing = AVSTREAM_PARSE_FULL;
             sample_rate_code= (v>>2) & 3;
-            if (!sample_rate_code)
-                return AVERROR(EIO);
-            ast->codec->sample_rate = 11025 << (sample_rate_code-1);
-            av_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
+            ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
+            avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
             len -= 4;
+        } else if (tag == TAG_DEFINESOUND) {
+            /* audio stream */
+            int sample_rate_code;
+            int ch_id = avio_rl16(pb);
+
+            for (i=0; i<s->nb_streams; i++) {
+                st = s->streams[i];
+                if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
+                    goto skip;
+            }
+
+            // FIXME: 8-bit uncompressed PCM audio will be interpreted as 16-bit
+            // FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
+            // these are smaller audio streams in DEFINESOUND tags, but it's technically
+            // possible they could be huge. Break it up into multiple packets if it's big.
+            v = avio_r8(pb);
+            ast = avformat_new_stream(s, NULL);
+            if (!ast)
+                return AVERROR(ENOMEM);
+            ast->id = ch_id;
+            ast->codec->channels = 1 + (v&1);
+            ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+            ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
+            ast->need_parsing = AVSTREAM_PARSE_FULL;
+            sample_rate_code= (v>>2) & 3;
+            ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
+            avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
+            ast->duration = avio_rl32(pb); // number of samples
+            if (((v>>4) & 15) == 2) { // MP3 sound data record
+                ast->skip_samples = avio_rl16(pb);
+                len -= 2;
+            }
+            len -= 7;
+            if ((res = av_get_packet(pb, pkt, len)) < 0)
+                return res;
+            pkt->pos = pos;
+            pkt->stream_index = ast->index;
+            return pkt->size;
         } else if (tag == TAG_VIDEOFRAME) {
-            int ch_id = get_le16(pb);
+            int ch_id = avio_rl16(pb);
             len -= 2;
             for(i=0; i<s->nb_streams; i++) {
                 st = s->streams[i];
-                if (st->codec->codec_type == CODEC_TYPE_VIDEO && st->id == ch_id) {
-                    frame = get_le16(pb);
-                    av_get_packet(pb, pkt, len-2);
+                if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
+                    frame = avio_rl16(pb);
+                    if ((res = av_get_packet(pb, pkt, len-2)) < 0)
+                        return res;
+                    pkt->pos = pos;
                     pkt->pts = frame;
                     pkt->stream_index = st->index;
                     return pkt->size;
                 }
             }
+        } else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
+#if CONFIG_ZLIB
+            long out_len;
+            uint8_t *buf = NULL, *zbuf = NULL, *pal;
+            uint32_t colormap[AVPALETTE_COUNT] = {0};
+            const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
+            const int colormapbpp = 3 + alpha_bmp;
+            int linesize, colormapsize = 0;
+
+            const int ch_id   = avio_rl16(pb);
+            const int bmp_fmt = avio_r8(pb);
+            const int width   = avio_rl16(pb);
+            const int height  = avio_rl16(pb);
+
+            len -= 2+1+2+2;
+
+            switch (bmp_fmt) {
+            case 3: // PAL-8
+                linesize = width;
+                colormapsize = avio_r8(pb) + 1;
+                len--;
+                break;
+            case 4: // RGB15
+                linesize = width * 2;
+                break;
+            case 5: // RGB24 (0RGB)
+                linesize = width * 4;
+                break;
+            default:
+                av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
+                goto bitmap_end_skip;
+            }
+
+            linesize = FFALIGN(linesize, 4);
+
+            if (av_image_check_size(width, height, 0, s) < 0 ||
+                linesize >= INT_MAX / height ||
+                linesize * height >= INT_MAX - colormapsize * colormapbpp) {
+                av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
+                goto bitmap_end_skip;
+            }
+
+            out_len = colormapsize * colormapbpp + linesize * height;
+
+            av_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
+                    ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
+
+            zbuf = av_malloc(len);
+            buf  = av_malloc(out_len);
+            if (!zbuf || !buf) {
+                res = AVERROR(ENOMEM);
+                goto bitmap_end;
+            }
+
+            len = avio_read(pb, zbuf, len);
+            if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
+                av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
+                goto bitmap_end_skip;
+            }
+
+            for (i = 0; i < s->nb_streams; i++) {
+                st = s->streams[i];
+                if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
+                    break;
+            }
+            if (i == s->nb_streams) {
+                vst = avformat_new_stream(s, NULL);
+                if (!vst) {
+                    res = AVERROR(ENOMEM);
+                    goto bitmap_end;
+                }
+                vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
+                vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+                vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
+                avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
+                st = vst;
+            }
+            st->codec->width  = width;
+            st->codec->height = height;
+
+            if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
+                goto bitmap_end;
+            pkt->pos = pos;
+            pkt->stream_index = st->index;
+
+            switch (bmp_fmt) {
+            case 3:
+                st->codec->pix_fmt = AV_PIX_FMT_PAL8;
+                for (i = 0; i < colormapsize; i++)
+                    if (alpha_bmp)  colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
+                    else            colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
+                pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
+                if (!pal) {
+                    res = AVERROR(ENOMEM);
+                    goto bitmap_end;
+                }
+                memcpy(pal, colormap, AVPALETTE_SIZE);
+                break;
+            case 4:
+                st->codec->pix_fmt = AV_PIX_FMT_RGB555;
+                break;
+            case 5:
+                st->codec->pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
+                break;
+            default:
+                av_assert0(0);
+            }
+            memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
+
+            res = pkt->size;
+
+bitmap_end:
+            av_freep(&zbuf);
+            av_freep(&buf);
+            return res;
+bitmap_end_skip:
+            av_freep(&zbuf);
+            av_freep(&buf);
+#else
+            av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
+#endif
         } else if (tag == TAG_STREAMBLOCK) {
-            st = s->streams[swf->audio_stream_index];
-            if (st->codec->codec_id == CODEC_ID_MP3) {
-                url_fskip(pb, 4);
-                av_get_packet(pb, pkt, len-4);
+            for (i = 0; i < s->nb_streams; i++) {
+                st = s->streams[i];
+                if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
+            if (st->codec->codec_id == AV_CODEC_ID_MP3) {
+                avio_skip(pb, 4);
+                if ((res = av_get_packet(pb, pkt, len-4)) < 0)
+                    return res;
             } else { // ADPCM, PCM
-                av_get_packet(pb, pkt, len);
+                if ((res = av_get_packet(pb, pkt, len)) < 0)
+                    return res;
             }
+            pkt->pos = pos;
             pkt->stream_index = st->index;
             return pkt->size;
+                }
+            }
         } else if (tag == TAG_JPEG2) {
             for (i=0; i<s->nb_streams; i++) {
                 st = s->streams[i];
-                if (st->id == -2)
+                if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
                     break;
             }
             if (i == s->nb_streams) {
-                vst = av_new_stream(s, -2); /* -2 to avoid clash with video stream and audio stream */
+                vst = avformat_new_stream(s, NULL);
                 if (!vst)
-                    return -1;
-                vst->codec->codec_type = CODEC_TYPE_VIDEO;
-                vst->codec->codec_id = CODEC_ID_MJPEG;
-                av_set_pts_info(vst, 64, 256, swf->frame_rate);
-                vst->codec->time_base = (AVRational){ 256, swf->frame_rate };
+                    return AVERROR(ENOMEM);
+                vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
+                vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+                vst->codec->codec_id = AV_CODEC_ID_MJPEG;
+                avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
                 st = vst;
             }
-            get_le16(pb); /* BITMAP_ID */
-            av_new_packet(pkt, len-2);
-            get_buffer(pb, pkt->data, 4);
+            avio_rl16(pb); /* BITMAP_ID */
+            if ((res = av_new_packet(pkt, len-2)) < 0)
+                return res;
+            avio_read(pb, pkt->data, 4);
             if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
                 AV_RB32(pkt->data) == 0xffd9ffd8) {
                 /* old SWF files containing SOI/EOI as data start */
                 /* files created by swink have reversed tag */
                 pkt->size -= 4;
-                get_buffer(pb, pkt->data, pkt->size);
+                avio_read(pb, pkt->data, pkt->size);
             } else {
-                get_buffer(pb, pkt->data + 4, pkt->size - 4);
+                avio_read(pb, pkt->data + 4, pkt->size - 4);
             }
+            pkt->pos = pos;
             pkt->stream_index = st->index;
             return pkt->size;
         }
-        url_fskip(pb, len);
+    skip:
+        avio_skip(pb, len);
     }
+}
+
+#if CONFIG_ZLIB
+static av_cold int swf_read_close(AVFormatContext *avctx)
+{
+    SWFContext *s = avctx->priv_data;
+    inflateEnd(&s->zstream);
+    av_freep(&s->zbuf_in);
+    av_freep(&s->zbuf_out);
+    av_freep(&s->zpb);
     return 0;
 }
+#endif
 
-AVInputFormat swf_demuxer = {
-    "swf",
-    NULL_IF_CONFIG_SMALL("Flash format"),
-    sizeof(SWFContext),
-    swf_probe,
-    swf_read_header,
-    swf_read_packet,
+AVInputFormat ff_swf_demuxer = {
+    .name           = "swf",
+    .long_name      = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
+    .priv_data_size = sizeof(SWFContext),
+    .read_probe     = swf_probe,
+    .read_header    = swf_read_header,
+    .read_packet    = swf_read_packet,
+#if CONFIG_ZLIB
+    .read_close     = swf_read_close,
+#endif
 };