9  * License as published by the Free Software Foundation; either
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
38     WebpContext *const w = s->priv_data;  in webp_init()
41     w->last_pkt = ffformatcontext(s)->pkt;  in webp_init()
43     if (s->nb_streams != 1) {  in webp_init()
47     st = s->streams[0];  in webp_init()
48     if (st->codecpar->codec_id != AV_CODEC_ID_WEBP) {  in webp_init()
59     int skip = 0;  in is_animated_webp_packet()  local
62     if (pkt->size < 4)  in is_animated_webp_packet()
64     if (AV_RL32(pkt->data) == AV_RL32("RIFF"))  in is_animated_webp_packet()
65         skip = 12;  in is_animated_webp_packet()
67     if (pkt->size < skip + 4)  in is_animated_webp_packet()
69     if (AV_RL32(pkt->data + skip) == AV_RL32("VP8X")) {  in is_animated_webp_packet()
70         flags |= pkt->data[skip + 4 + 4];  in is_animated_webp_packet()
80     WebpContext *w = s->priv_data;  in flush()
81     AVStream *st = s->streams[0];  in flush()
83     if (w->last_pkt->size) {  in flush()
84         int skip = 0;  in flush()  local
88         if (AV_RL32(w->last_pkt->data) == AV_RL32("RIFF"))  in flush()
89             skip = 12;  in flush()
91         if (AV_RL32(w->last_pkt->data + skip) == AV_RL32("VP8X")) {  in flush()
92             flags |= w->last_pkt->data[skip + 4 + 4];  in flush()
94             skip += AV_RL32(w->last_pkt->data + skip + 4) + 8;  in flush()
97         if (!w->wrote_webp_header) {  in flush()
98             avio_write(s->pb, "RIFF\0\0\0\0WEBP", 12);  in flush()
99             w->wrote_webp_header = 1;  in flush()
100             if (w->frame_count > 1)  // first non-empty packet  in flush()
101                 w->frame_count = 1;  // so we don't count previous empty packets.  in flush()
104         if (w->frame_count == 1) {  in flush()
111                 avio_write(s->pb, "VP8X", 4);  in flush()
112                 avio_wl32(s->pb, 10);  in flush()
113                 avio_w8(s->pb, flags);  in flush()
114                 avio_wl24(s->pb, 0);  in flush()
115                 avio_wl24(s->pb, st->codecpar->width - 1);  in flush()
116                 avio_wl24(s->pb, st->codecpar->height - 1);  in flush()
119                 avio_write(s->pb, "ANIM", 4);  in flush()
120                 avio_wl32(s->pb, 6);  in flush()
121                 avio_wl32(s->pb, 0xFFFFFFFF);  in flush()
122                 avio_wl16(s->pb, w->loop);  in flush()
126         if (w->frame_count > trailer) {  in flush()
127             avio_write(s->pb, "ANMF", 4);  in flush()
128             avio_wl32(s->pb, 16 + w->last_pkt->size - skip);  in flush()
129             avio_wl24(s->pb, 0);  in flush()
130             avio_wl24(s->pb, 0);  in flush()
131             avio_wl24(s->pb, st->codecpar->width - 1);  in flush()
132             avio_wl24(s->pb, st->codecpar->height - 1);  in flush()
133             if (w->last_pkt->pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE) {  in flush()
134                 avio_wl24(s->pb, pts - w->last_pkt->pts);  in flush()
136                 avio_wl24(s->pb, w->last_pkt->duration);  in flush()
137             avio_w8(s->pb, 0);  in flush()
139         avio_write(s->pb, w->last_pkt->data + skip, w->last_pkt->size - skip);  in flush()
140         av_packet_unref(w->last_pkt);  in flush()
148     WebpContext *w = s->priv_data;  in webp_write_packet()
151     if (!pkt->size)  in webp_write_packet()
156     w->using_webp_anim_encoder |= ret;  in webp_write_packet()
158     if (w->using_webp_anim_encoder) {  in webp_write_packet()
159         avio_write(s->pb, pkt->data, pkt->size);  in webp_write_packet()
160         w->wrote_webp_header = 1;  // for good measure  in webp_write_packet()
163         if ((ret = flush(s, 0, pkt->pts)) < 0)  in webp_write_packet()
165         av_packet_ref(w->last_pkt, pkt);  in webp_write_packet()
167     ++w->frame_count;  in webp_write_packet()
175     WebpContext *w = s->priv_data;  in webp_write_trailer()
177     if (w->using_webp_anim_encoder) {  in webp_write_trailer()
178         if (w->loop) {  // Write loop count.  in webp_write_trailer()
179             avio_seek(s->pb, 42, SEEK_SET);  in webp_write_trailer()
180             avio_wl16(s->pb, w->loop);  in webp_write_trailer()
187         filesize = avio_tell(s->pb);  in webp_write_trailer()
188         avio_seek(s->pb, 4, SEEK_SET);  in webp_write_trailer()
189         avio_wl32(s->pb, filesize - 8);  in webp_write_trailer()
191         avio_seek(s->pb, filesize, SEEK_SET);  in webp_write_trailer()
200     { "loop", "Number of times to loop the output: 0 - infinite loop", OFFSET(loop),